Concept of Rule of Law
The concept of Rule of law is of old origin and is an ancient ideal. It was discussed by ancient Greek philosophers such as Plato and Aristotle around 350 BC. Plato wrote: “Where the law is subject to some other authority and has none of its own, the collapse of the state, in my view, is not far off; but if law is the master of the government and the government is its slave, then the situation is full of promise and men enjoy all the blessings that the gods shower on a state". Likewise, Aristotle also endorsed the concept of Rule of law by writing that "law should govern and those in power should be servants of the laws." 
The phrase ‘Rule of Law’ is derived from the French phrase ‘la principe de legalite’ (the principle of legality) which refers to a government based on principles of law and not of men.  Rule of law is one of the basic principles of the English Constitution and the doctrine is accepted in the Constitution of U.S.A and India as well. The entire basis of Administrative Law is the doctrine of the rule of law. 
Sir Edward Coke, the Chief Justice of King James I’s reign was the originator of this concept. He maintained that the King should be under God and the Law and he established the supremacy of the law against the executive and that there is nothing higher than law. 
Later, Albert Venn Dicey (a British jurist and constitutional theorist) developed the concept in his book ‘The Law of the Constitution’ (1885). His writing on the British Constitution (which is unwritten) included three distinct though kindered ideas on Rule of law  :
(i) Absence of discretionary powers and supremacy of Law: viz. no man is above law. No man is punishable except for a distinct breach of law established in an ordinary legal manner before ordinary courts. The government cannot punish any one merely by its own fiat. Persons in authority do not enjoy wide, arbitrary or discretionary powers. Dicey asserted that wherever there is discretion there is room for arbitrariness.
(ii) Equality before law: Every man, whatever his rank or condition, is subject to the ordinary law and jurisdiction of the ordinary courts. No person should be made to suffer in body or deprived of his property except for a breach of law established in the ordinary legal manner before the ordinary courts of the land.
(iii) Predominance of legal spirit: The general principles of the British Constitution, especially the liberties and the rights of the people must come from traditions and customs of the people and be recognized by the courts in administration of justice from time to time.
The expression ‘rule of law’ is one which, over the years, has been used to convey a wide variety of ideas and has a number of meanings and corollaries including their criticisms. In common parlance it is often used simply to describe the state of affairs in a country where, in the main, the law is observed and order is kept – i.e., as an expression synonymous with ‘law and order’. To public lawyers, however, the phrase conveys something a little more precise. For them, the phrase is inextricably linked with the writings of Dicey. 
Rule of Law under the Indian Constitution
In India, the concept of Rule of law can be traced back to the Upanishads.  In modern day as well, the scheme of the Indian Constitution is based upon the concept of rule of law. The framers of the Constitution were well familiar with the postulates of rule of law as propounded by Dicey and as modified in its application to British India. It was therefore, in the fitness of things that the founding fathers of the Constitution gave due recognition to the concept of rule of law. 
The doctrine of Rule of Law as enunciated by Dicey has been adopted and very succinctly incorporated in the Indian Constitution. The ideals of the Constitution viz; justice, liberty and equality are enshrined in the Preamble itself (which is part of the Constitution).
The Constitution of India has been made the supreme law of the country and other laws are required to be in conformity with it. Any law which is found in violation of any provision of the Constitution, particularly, the fundamental rights, is declared void.  The Indian Constitution also incorporates the principle of equality before law and equal protection of laws enumerated by Dicey under Article 14  .
The very basic human right to life and personal liberty has also been enshrined under Article 21. Article 19(1) (a) of the Indian Constitution guarantees the third principle of the Rule of law (freedom of speech and Expression). No person can be convicted of any offence except for violation of a law in force at the time of the commission of the act charged as an offence is also very well recognized in the Indian Constitution.  The principles of double jeopardy and self-incrimination also found its rightful place in the Constitution.  Articles 14, 19 and 21 are so basic that they are also called the golden triangle Articles of the Indian Constitution.
The Constitution also ensures an independent an impartial Judiciary to settle disputes and grievances for violation of fundamental rights by virtue of Articles 32 and 226. In Union of India v. President, Madras Bar Association  , the Supreme Court held that “Rule of Law has several facets, one of which is that disputes of citizens will be decided by Judges who are independent and impartial; and that disputes as to legality of acts of the Government will be decided by Judges who are independent of the Executive." 
Justice R.S. Pathak of the Hon’ble Supreme Court has observed that “It must be remembered that our entire constitutional system is founded on the rule of law, and in any system so designed it is impossible to conceive of legitimate power which is arbitrary in character and travels beyond the bounds of reason." 
Rule of Law – part of the Basic Structure
The Constitution (First Amendment) Act, 1951, shocked the status of Rule of law in India. The question which came up for consideration in Shankari Prasad v. Union of India  was whether the fundamental rights can be amended under Article 368. The Supreme Court held that Parliament has the power to amend Part III of the Constitution under Article 368 as under Article 13 ‘law’ means any legislative action and not a constitutional amendment. Therefore, a constitutional amendment would be valid if abridges any of the fundamental rights.
The question again came up for consideration in Sajjan Singh v. State of Rajasthan  in which the Supreme Court approved the majority judgment in Shankari Prasad case and held that amendment of the Constitution means amendment of all provisions of the Constitution. Hon’ble Chief Justice Gajendragadkar held that if the framers of the constitution intended to exclude fundamental rights from the scope of the amending power they would have made a clear provision in that behalf.
However, both these cases were overruled by the Apex Court in Golaknath v. State of Punjab  and it held that Parliament has no power to amend the Part III of the Constitution so as to take away or abridges the fundamental rights and thus, at the end the Rule of law was sub-served by the Judiciary from abridging away. However, the Rule of law was crumpled down with the Constitution (Twenty-Fourth Amendment) Act, 1971. Parliament by the way of this Amendment inserted a new clause (4) in Article 13 which provided that ‘nothing in this Article shall apply to any amendment of this constitution made under Art 368’. It substituted the heading of Article 368 from ‘Procedure for amendment of Constitution’ to ‘Power of Parliament to amend Constitution and Procedure thereof’. The Amendment not only restored the amending power of the Parliament but also extended its scope by adding the words “to amend by way of the addition or variation or repeal any provision of this constitution in accordance with the procedure laid down in the Article".
This was challenged in the case of Keshavananda Bharti v. State of Kerala  . The Supreme Court by majority overruled the decision given in Golaknath’s case and held that Parliament has wide powers of amending the Constitution and it extends to all the Articles, but the amending power is not unlimited and does not include the power to destroy or abrogate the basic feature or framework of the Constitution. There are implied limitations on the power of amendment under Article 368. Within these limits Parliament can amend every Article of the Constitution. Thus, Rule of law prevailed.
In Keshavananda Bharti v. State of Kerala  , the Supreme Court states that “Our Constitution postulates Rule of Law in the sense of supremacy of the Constitution and the laws as opposed to arbitrariness."  The 13 judge Bench also laid down that the Rule of law is an “aspect of the basic structure of the Constitution, which even the plenary power of Parliament cannot reach to amend." 
Since Keshavananda case, Rule of law has been much expanded and applied differently in different cases. In Indira Nehru Gandhi v. Raj Narain  , the Supreme Court invalidated Clause (4) of Article 329-A inserted by the Constitution (Thirty-ninth Amendment) Act, 1975 to immunise the election dispute to the office of the Prime Minister from any kind of judicial review.  The Court said that this violated the concept of Rule of law which cannot be abrogated or destroyed even by the Parliament. 
The Habeas Corpus case  according to many scholars is a black mark on the rule of law. The case entails Dicey’s third principle of rule of law. The legal question in this case was whether there is any rule of law over and above the Constitutional rule of law and whether there was any rule of law in India apart from Article 21 of the Constitution regarding right to life and personal liberty. A five judge Bench with a majority of 4:1 (going by strict interpretation) held in the negative.
The majority judges held that the Constitution is the mandate and the rule of law. They held that there cannot be any rule of law other than the constitutional rule of law. Excluding moral conscience, they held that there cannot be any pre-Constitution or post-Constitution rule of law which can run counter to the rule of law embodied in the Constitution, nor can there be any rule of law to nullify the constitutional provisions during the time of Emergency. 
The majority judges held that “Article 21 is our rule of law regarding life and liberty. No other rule of law can have separate existence as a distinct right. The rule of law is not merely a catchword or incantation. It is not a law of nature consistent and invariable at all times and in all circumstances. There cannot be a brooding and omnipotent rule of law drowning in its effervescence the emergency provisions of the Constitution."  Thus they held that Article 21 is the sole repository of right to life and liberty and during an emergency, the emergency provisions themself constitute the rule of law.
In a powerful dissent, Justice H.R. Khanna observed that “Rule of law is the antithesis of arbitrariness...Rule of law is now the accepted form of all civilized societies...Everywhere it is identified with the liberty of the individual. It seeks to maintain a balance between the opposing notions of individual liberty and public order. In every state the problem arises of reconciling human rights with the requirements of public interest. Such harmonizing can only be attained by the existence of independent courts which can hold the balance between citizen and the state and compel governments to conform to the law." 
With the Constitution (Forty-Fourth Amendment) Act, 1978 it has been laid down that even during emergency, Articles 20 and 21 will not be suspended. According to me, Justice Khanna (with due respect to his high moral conscience) has not given a judgment in consonance with the rule of law. His Lordship has on the other hand tried to place the judiciary over and above the rule of law. During emergency, that was the rule of law that Article 21 is suspended. Creating rule of law above the Constitution will create huge implications. Whatever be the case, the Austinian sense of jurisprudence does apply in the present case and the majority judges have not decided wrongly. Though now it remains only an academic question but if a law does not seem to be morally rich then it is the job of the Legislature to amend it and not the Judiciary to come up with its own new law which is non-existent and against the existing law. 
In Raman Dayaram Shetty v. International Airport Authority of India  , the Supreme Court held that the great purpose of rule of law is the protection of individual against arbitrary exercise of power, wherever it is found. In re: Arundhati Roy  , Justice Sethi observed that for achieving the establishment of the rule of law, the Constitution has assigned the special task to the judiciary.
When Article 371-D(5) (Proviso) authorized the A.P Government to nullify any decision of the Administrative Services Tribunal, it was held violative of the rule of law. Holding the provision unconstitutional, the Supreme Court said that it is a basic principle of the rule of law that the exercise of power by the Executive must not only be governed by the Constitution but also be in accordance with law. The Court also held that the power of judicial review should be used to ensure that rule of law is maintained. 
Over the years, the Courts have used judicial activism to expand the concept of rule of law.  For example, in Courts are trying to establish a rule of law society in India by insisting on ‘fairness’. In Sheela Barse v. State of Maharashtra  the Supreme Court insisted on fairness to women in police lock-up and also drafted a code of guidelines for the protection of prisoners in police custody, especially female prisoners. In Veena Sethi v. State of Bihar  also the Supreme Court extended the reach of rule of law to the poor who constitute the bulk of India by ruling that rule of law does not merely for those who have the means to fight for their rights and expanded the locus standi principle to help the poor.
Adherence to Rule of Law: A Critique