Purity in the Gita is more than cleanliness. It points to clarity of motive, honesty of conduct and a heart not clouded by resentment, craving or pretense. People often associate purity with rules, yet the Gita treats it as a living quality that shows in how we act, speak and think, and in whether our actions match what we say we value.
The Gita lists purity among foundational qualities. Gita 16.1 begins its list of divine qualities with fearlessness and a pure heart, together with self-control and honesty, and Gita 13.8 includes purity and uprightness among the expressions of true knowledge. Gita 12.16 describes a devotee who is inwardly and outwardly pure, skillful and free from self-serving ventures. Gita 16.7 shows how, when discernment is lost, purity, proper conduct and truth are also lost.
It describes purity at three levels. Gita 17.14 describes purity of the body as reverence for the worthy, keeping oneself pure and upright, restraint and avoiding harm to others, and Gita 17.16 describes purity of the mind as calmness, gentleness, quiet reflection and clean intentions. Gita 14.6 notes that even sattva can bind when we cling to it, and Gita 13.33 compares the self to space that nothing can stain. Keep your conduct honest and your motives clear, without pride.