The Upanishads

Dhyana - Meditation

The practice of sustained contemplation on the Self.

Dhyana is continuous flow of awareness toward the Self. Through practice, the mind becomes still and the nature of consciousness is revealed directly.

Having made the mind still, see the Self in the self.

Katha Upanishad, Katha Upanishad 2.3.13

Meditation is the primary means of self-realization.

Katha Upanishad