1. Core Legal Answer & Context: Social justice is a foundational pillar of the Indian Constitution, aiming to create an egalitarian society by eliminating socio-economic disparities and ensuring a dignified life for all citizens. It is not merely a philosophical ideal but a constitutional mandate that permeates the Preamble, Fundamental Rights (Part III), and Directive Principles of State Policy (Part IV). The concept seeks to balance individual liberty with collective welfare, ensuring that the benefits of development reach the most vulnerable sections of society.

Chapter IV (Directive Principles of State Policy - Articles 36-51) explicitly outlines the socio-economic goals of the state, serving as a moral compass for governance. These principles, though not directly enforceable, are fundamental in the governance of the country and it shall be the duty of the State to apply these principles in making laws. They include directives for securing a social order for the promotion of welfare of the people (Article 38), securing adequate means of livelihood, equitable distribution of material resources, equal pay for equal work, protection of workers' health, and opportunities for children's healthy development (Article 39). Other articles promote education, public assistance, living wage, and upliftment of weaker sections.

Article 14, enshrined in Part III (Fundamental Rights), guarantees 'equality before the law' and 'equal protection of the laws'. While seemingly a negative right preventing discrimination, it has been interpreted dynamically by the judiciary to include positive obligations on the state to achieve substantive equality. This involves not just treating equals equally, but also treating unequals unequally to bring them to a level playing field, thereby serving the cause of social justice. This allows for reasonable classification and affirmative action (reservations) to address historical disadvantages and promote social justice.

2. Relevant Statutes and Sections:

• Preamble: Secures 'Justice, social, economic and political' to all citizens.
• Part III (Fundamental Rights):
  • Article 14: Equality before law and equal protection of laws.
  • Article 15: Prohibition of discrimination on grounds of religion, race, caste, sex or place of birth (with provisions for special provisions for women, children, and socially/educationally backward classes).
  • Article 16: Equality of opportunity in matters of public employment (with provisions for reservation).
  • Article 17: Abolition of Untouchability.
• Part IV (Directive Principles of State Policy):
  • Article 38: State to secure a social order for the promotion of welfare of the people.
  • Article 39: Certain principles of policy to be followed by the State (e.g., adequate means of livelihood, equitable distribution of resources, equal pay for equal work).
  • Article 39A: Equal justice and free legal aid.
  • Article 41: Right to work, to education and to public assistance in certain cases.
  • Article 42: Provision for just and humane conditions of work and maternity relief.
  • Article 43: Living wage, etc., for workers.
  • Article 46: Promotion of educational and economic interests of Scheduled Castes, Scheduled Tribes and other weaker sections.

3. Important Landmark Cases:

• Kesavananda Bharati v. State of Kerala (1973): Affirmed that the Preamble, including the ideal of social justice, is part of the basic structure of the Constitution and cannot be amended to destroy its essence.
• Minerva Mills v. Union of India (1980): Emphasized the harmony and balance between Fundamental Rights and Directive Principles, stating that they are the 'conscience of the Constitution' and together form the core of social revolution.
• Air India Statutory Corporation v. United Labour Union (1997): The Supreme Court held that social justice is a fundamental right and forms the bedrock of the Constitution, implying that the state has an obligation to ensure it.
• Indra Sawhney v. Union of India (1992): This landmark case dealt extensively with reservations (affirmative action) under Articles 15(4) and 16(4), upholding their constitutionality as a means to achieve social justice for backward classes, while also laying down the 'creamy layer' concept and limits on reservation percentages.

4. Clear Conclusion: The concept of social justice is central to India's constitutional philosophy, acting as a guiding principle for both legislative and judicial actions. While Chapter IV provides the aspirational framework for a just society, Article 14, along with other Fundamental Rights, provides the enforceable legal tools to achieve this vision. The judiciary has played a crucial role in interpreting these provisions dynamically, ensuring that the state actively works towards dismantling inequalities and fostering an inclusive, equitable society, thereby transforming the constitutional ideal into a living reality for its citizens. It is a continuous endeavor to bridge the gap between formal equality and substantive equality, making social justice a dynamic and evolving concept in Indian jurisprudence.