By meditation: meditation is the drawing-in of the instruments, hearing and the rest, from the objects sound and the rest into the mind, and of the mind into the inward conscious one, and the one-pointed dwelling that is the thinking; this is meditation, by the borrowing of the simile 'the heron as it were meditates, the earth as it were meditates, the mountains as it were meditate' (Chāndogya 7.6.1). Meditation is a cognition unbroken, continuous as a stream of poured oil; by that meditation some yogins see the Self, the inward conscious one, in the Self, in the intellect, by their own inward-conscious inner instrument refined by meditation. Others see it by the Sāṅkhya yoga: Sāṅkhya is the thinking 'these qualities, sattva, rajas and tamas, are things I see; I am other than they, the witness of their workings, eternal, distinct from the qualities, the Self'; this is the Sāṅkhya yoga, and by it they see the Self by the Self. And others by the yoga of action: action itself is the yoga, the doing carried out with the cognition of offering to the Lord, called yoga figuratively because it serves the purpose of yoga; by it, through the purification of being and the arising of knowledge, others see.
Contemporary English rendering of the Sanskrit bhāṣya, pending scholar review.