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
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.
The mind of the yogi in meditation is compared to a steady light kept in a windless place. The illustration is fascinating and appropriate. Like the lamp, the mind of the yogi is effulgent with the light of knowledge, and it is also steady. The windows of the senses through which the objective world gets into the mind causing destruction are closed by perfect self-control, and so the mind remains steady and firm in meditation. Just as the orb of the Sun is clearly reflected in a pure calm lake when there are no ripples or waves, so also the Self is clearly reflected in a pure calm mind. The impure mind is unsteady and restless due to the winds of desire blowing constantly, like the light placed in a windy place.
Question: To what is the meditating mind of the yogi compared?
Answer: It is compared to a lamp kept in a windless place. The idea is, that the mind of the yogi is steady and illumined with the light of Knowledge.
Question: How should the mind be when it is to be merged in Atma?
Answer: It should be perfectly controlled and free from any kind of disturbance resulting from the play of the senses.