We dont say that scientific knowledge is useless. Mechanics, electronics, this is also knowledge. But the central point is atma jnana ? self knowledge, knowledge of the soul. In these thirty one essays, talks, and informal conversations, His Divine Grace A.C. Bhaktivedanta Swami Prabhupada reveals the central point of essential self knowledge, a knowledge that makes all other knowledge and activities pale in comparison. Brighten your life with the light of self knowledge and gain a world perspective usually reserved for ascetics and saints.