उद्धरेदात्मनात्मानं नात्मानमवसादयेत्। आत्मैव ह्यात्मनो बन्धुरात्मैव रिपुरात्मनः॥ Translation: Elevate yourself through your own efforts, and do not degrade yourself. The mind can be your best friend and also your worst enemy.

Bhagavad Gita - (Chapter 6, Verse 5)