Bhagavad Gita on Meditation

BG 6.10

योगी युञ्जीत सततमात्मानं रहसि स्थितः।

Let the yogi constantly strive to keep the mind steady, remaining in solitude, alone, with the body and mind controlled, and free from hope and greed.

BG 6.17

युक्ताहारविहारस्य युक्तचेष्टस्य कर्मसु।

Yoga becomes the destroyer of pain for him who is moderate in eating and recreation (such as walking, etc.), who exercises moderation in action, and who is moderate in sleep and wakefulness.

BG 6.26

यतो यतो निश्चरति मनश्चञ्चलमस्थिरम्।

From whatever cause the restless and unsteady mind wanders away, let him restrain it from that and bring it under the control of the Self alone.

BG 6.34

चञ्चलं हि मनः कृष्ण प्रमाथि बलवद्दृढम्।

The mind is indeed restless, turbulent, strong, and unyielding, O Krishna; I consider it as difficult to control as controlling the wind.

BG 6.35

श्री भगवानुवाच

The Blessed Lord said, "Undoubtedly, O mighty-armed Arjuna, the mind is difficult to control and restless; but with practice and dispassion, it can be restrained."

BG 8.14

अनन्यचेताः सततं यो मां स्मरति नित्यशः।

I am easily attainable by that ever-steadfast yogi who constantly and daily remembers me for a long time, not thinking of anything else with a single-minded or one-pointed focus, O Partha.