Preamble of Indian Consti

The preamble of Indian constitution goes like this
"WE, THE PEOPLE OF INDIA, having solemnly resolved to constitute India into a SOVEREIGN SOCIALIST SECULAR DEMOCRATIC REPUBLIC and to secure to all its citizens:
JUSTICE, social, economic and political;
LIBERTY of thought, expression, belief, faith and worship
EQUALITY of status and of opportunity;
and to promote among them all FRATERNITY assuring the dignity of the individual and the unity and integrity of the Nation;
N OUR CONSTITUENT ASSEMBLY this twenty-sixth day of November, 1949, do HEREBY ADOPT, ENACT AND GIVE TO OURSELVES THIS CONSTITUTION. [1] "

It was initially consider not to be a part of constitution and can't be legally forced in law of court.
But in 1974 ''Kesavananda Bharati v. State of Kerala'' case supreme court has changed this notion

"SOCIALIST" and "SECULAR" were not actually in the premeable. It was later added in 42the amendment in 1976.