The entire Vedanta siddhanta (doctrine) says that the great problem of man is avidya, ajnana. All suffering, all tapa-traya, all problems, all the complications that the human individual soul which is part and parcel of the supreme, all-perfect Divinity under goes are due to ignorance. It is that which causes the individual to make the wrong choice and to later regret. Through knowledge alone can ultimate liberation be attained. – Swami Chidananda