Without Kṛṣṇa consciousness, everyone is acting on different material consciousness. "I am American. Therefore I must work in this way. I must fight with the Russians." Russian thinking that "I am Russian. I must fight the Americans." Or the China... So many designations. This is called māyā, illusion.
So we have to purify. That purification means one must know that "I am not this body. I am spirit soul." So what I am doing as spirit soul? Whatever I am working, at the present moment, on this bodily concept of life... But what about, what I am doing as spirit soul? This knowledge required.