Bhagwad Gita
Chapter 6, Verse 20
यत्रोपरमते चित्तं निरुद्धं योगसेवया।
यत्र चैवात्मनाऽऽत्मानं पश्यन्नात्मनि तुष्यति।।6.20।।
When the mind, restrained by the practice of yoga, attains quietude, and when one sees the Self by the Self, they are satisfied in their own Self.