Know that every thought and word that weakens you in the world is the only evil that exists. Whatever makes man weak and fear is the only evil that should be shunned.The greatest sin is to think yourself weak.I beg you to understand this one fact - no good comes out of the man who day and night thinks he is nobody. If a man day and night thinks he is miserable low and nothing, nothing he becomes... That is the great fact which you ought to remember.
-Swami Vivekananda