BG 6.12-13

Seated firmly on it, the yogi should strive to purify the mind by focusing it in meditation with one pointed concentration, controlling all thoughts and activities. He must hold the body, neck, and head firmly in a straight line, and gaze at the tip of the nose, without allowing the eyes to wander.

BG 17.24

Therefore, when performing acts of sacrifice, offering charity, or undertaking penance, expounders of the Vedas always begin by uttering “Om” according to the prescriptions of Vedic injunctions.

BG 17.25

Persons who do not desire fruitive rewards, but seek to be free from material entanglements, utter the word “Tat” along with acts of austerity, sacrifice, and charity.

BG 17.25

Persons who do not desire fruitive rewards, but seek to be free from material entanglements, utter the word “Tat” along with acts of austerity, sacrifice, and charity.

BG 18.33

The steadfast willpower that is developed through Yog, and which sustains the activities of the mind, the life-airs, and the senses, O Parth, is said to be determination in the mode of goodness.