In all the gates, the gates of the Self's perceiving, hearing and the rest, all the instruments, in all those gates a function, an illumination, of the inner instrument, the intellect, arises in this body. That is knowledge. When an illumination named knowledge thus arises, then, by the mark of the light of knowledge, one should know that sattva has grown, has risen up. This is the sign of risen-up rajas.
Contemporary English rendering of the Sanskrit bhāṣya, pending scholar review.