yadā—when; viniyatam—particularly disciplined; cittam—the mind and its activities; ātmani—in the Transcendence; eva—certainly; avatiṣṭhate—becomes situated; nispṛhaḥ—devoid of; sarva—all kinds of; kāmebhyaḥ—material desires; yuktaḥ—well situated in yoga; iti—thus; ucyate—is said to be; tadā—at that time.
When the yogī, by practice of yoga, disciplines his mental activities and becomes situated in Transcendence-devoid of all material desires-he is said to have attained yoga.
yathā—as; dīpaḥ—a lamp; nivātasthaḥ—in a place without wind; na—does not; iṅgate—waver; sā upamā—compared to that; smṛtā—likened; yoginaḥ—of the yogī; yata-cittasya—whose mind is controlled; yuñjataḥ—constantly engaged in; yogam—meditation; ātmanaḥ—on Transcendence.
As a lamp in a windless place does not waver, so the transcendentalist, whose mind is controlled, remains always steady in his meditation on the transcendent Self.