13.25 Dhyanena, through meditation: Meditation means contemplation (on the Self) after withdrawing into the mind with concentration the organs of hearing etc. from the objects like sound etc., and then withdrawing the mind into the indwelling conscious Self. Thus, from the citation of such illustrations as, 'the crane meditates, as it were, 'the earth meditates, as it were; the mountains meditate, as it were' (Ch. 7.6.1), it follows that meditation is a constant and uninterrupted current of thought like a line of pouring oil. Through that meditation, kecit, some yogis; pasyanti, realize; the indwelling conscious atmanam, Self; atmani, in (their) intellect; atmana, with the help of the internal organ that has been purified by meditation.
Anye, others; sankhyena yogena, through Sankhya-yoga: Sankhya means thinking, 'These alities, viz sattva, rajas and tamas, are objects of my perception; I am the Self, distinct from them, a witness of their functions, eternal and different from the alities.' This Sankhya is Yoga. [By Sankhya is meant that knowledge which arises from the foregoing reflection. This knowledge is itself called Yoga (concentration of mind) inasmuch as it is similar to Yoga in leading to the realization of the Self.] Through that they realize the Self with the help of the internal organ. This is how it is to be construed.
And anye, others; karma-yogena, through Karma-yoga-action itself being the Yoga: Action performed with the idea of dedication to God is figuratively called Yoga since it leads to Yoga. (others realize) with the help of that (action), through purification of the mind and rise of Knowledge. [The best among the yogis are competent for meditation (dhyana); the modiocre for reflection (Sankhya); and the lowest for Karma-yoga.]