Alexander the great went to India in his quest for conquering the world. There he meets a naked Yogi lying on the bank of a river contemplating dirt. He then asks this Yogi,"What are you doing here?" Yogi replied, "I am experiencing nothingness." Yogi then asks Alexander, "What are you doing here?" Alexander replied, "I am conquering the world."

Both thought the other must be a fool. For yogis, conquering the world is pointless and for Alexander, sitting there and doing nothing was a waste of life.