Bhagavadgita, Chapter 6 Verse 5:

Referring to the Bhagavadgita, Chapter 6 Verse 5:

उद्धरॆत् आत्मना आत्मानं न आत्मानम् अवसादयॆत् ।
आत्म एव हि आत्मनः बंधुः आत्म एव रिपुः आत्मनः ॥ ६.५ ॥

Translated broadly as: "Let a man raise himself by himself, let him not lower himself; for he alone is the friend of himself, he alone is the enemy of himself." (Swami Sivananda)