A tree that has roots deep in the ground cannot be destroyed when its branches or leaves are cut off. Likewise, when evil qualities like hatred and envy have struck deep roots, they cannot be got rid off by striking at some branches. By suppressing bad thoughts intermittently, these evils cannot be eradicated. The mind has to be completely emptied of all bad thoughts to achieve real peace. Every bad thought must be rooted out the moment it arises in the mind. The war against bad thoughts is like the war against enemy hordes who attempt to get behind a fort through a subterranean tunnel. As one member of the enemy emerges from the tunnel, he should be struck down. Each one of the sense organs – the eye, the tongue or the ear – when it is influenced by a bad thought is led astray and behaves improperly. When they are influenced by good thoughts and impulses, they act in a manner which produces joy and contentment.