Bhagavad Gita: Chapter 6, Verse 19

यथा दीपो निवातस्थो नेङ्गते सोपमा स्मृता |
योगिनो यतचित्तस्य युञ्जतो योगमात्मन: || 19||

yathā dīpo nivāta-stho neṅgate sopamā smṛitā
yogino yata-chittasya yuñjato yogam ātmanaḥ

yathā—as; dīpaḥ—a lamp; nivāta-sthaḥ—in a windless place; na—does not; iṅgate—flickers; sā—this; upamā—analogy; smṛitā—is considered; yoginaḥ—of a yogi; yata-chittasya—whose mind is disciplined; yuñjataḥ—steadily practicing; yogam—in meditation; ātmanaḥ—on the Supreme

yatha dipo nivata-stho nengate sopama smrita
yogino yata-chittasya yunjato yogam atmanah

Translation

BG 6.19: Just as a lamp in a windless place does not flicker, so the disciplined mind of a yogi remains steady in meditation on the Supreme.

Commentary

In this verse, Shree Krishna gives the simile of the flame of a lamp. In the wind, the flame flickers naturally and is impossible to control. However, in a windless place, the flame becomes as steady as a picture. Similarly, the mind is fickle by nature and very difficult to control. But when the mind of a yogi is in enthralled union with God, it becomes sheltered against the winds of desire. Such a yogi holds the mind steadily under control by the power of devotion.