Secular was added in 1976 during the Emergency, but Socialist was there in the original. Look at the Directive Principles of the Constitution. It says that the Indian Union should strive for a socialistic pattern of society. It is the original constitution as well. You can not say fathers who drafted our constitution either. Indian constitution was based on 1935 India Government Act, written by the British, then in 1947-51 it was again revised by the British officers. Indians have very little to write on Indian constitution. This is the fact. There is no such thing called founding fathers. All were illegitimate persons put there by the British. India was not USA. So Don't copy words which do not fit for India. Indian constitution was damaged by the "British Agent" Ambedkar, who was against the freedom of India but M.K.Gandhi made another blunder and put as the chairman of the drafting committee. He took advantage of that and made the caste system permanent. Otherwise, Caste will be abolished in 1951.