Bhagavad Gita 2.55

2.55 The Blessed Lord said When a man completely casts off, O Arjuna, all the desires of the mind and is satisfied in the Self by the Self, then is he said to be one of steady wisdom.

The Supreme Personality of Godhead said: O Pārtha, when a man gives up all varieties of desire for sense gratification, which arise from mental concoction, and when his mind, thus purified, finds satisfaction in the self alone, then he is said to be in pure transcendental consciousness.