History of Directive Principles -
The Fundamental Rights and the Directive Principles (DP / DPSP) have a common origin. The Nehru Report of 1928 (All Parties Conference Committee Report, 1928. It was chaired by Motilal Nehru. Hence is popularly known as Nehru Committee Report) which contained a Swaraj Constitution of India incorporated some fundamental rights. These included such rights as the right of elementary education. The Sapru Report of 1945 (Constitutional proposals of Sir Tej Bahadur Sapru Committee, 1945) clearly divided the fundamental rights into two categories - justiciable and non-justiciable. Sir B. N. Rau, Constitutional Adviser to the Constituent Assembly advised that the individual rights should be divided into two categories. Those which can be enforeced by a court and those which are not so enforceable. The latter he thought are moral precepts for the authorities of the State. His suggestion was accepted by the Drafting Committee. As a result we have Fundamental Rights which are justiciable in Part III and DPs which are non-justiciable in Part IV.
The objective of both is securing social, economic and political justice and dignity and welfare of the individual.
Our Constitution makers followed the model of the Constitution of Eire / Ireland which sets forth certain principles of social policy for the guidance of the State but which are not cognizable by any court.