By His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
A Krishna conscious person should not be a fool. He can explain how these universal planets are floating and how the soul is evolving through different species of life. There are different departments of scientific knowledge – physics, botany, chemistry, astronomy, and so on. Krishna says, yaj jñatva: “If through Krishna consciousness you understand the knowledge I’m presenting, then you'll have nothing left to know.” That means you'll have complete knowledge. We are hankering after knowledge, but if we are in knowledge of Krishna consciousness, and if we know Krishna, then all knowledge is included. You'll have full knowledge about the constitutional position of yourself, this material world, the spiritual world, God, our interrelationship, time, space, everything. There are many things to be known, but the principal things are God, the living entities, time, work, and the material energy.