A yogi has learned to weaken ignorance and increase the light of knowledge

Verse 4.13

ते व्यक्तसूक्ष्माः गुणात्मानः ॥१३॥

te vyakta-sūkṣmāḥ guṇa-ātmānaḥ ||13||

They are manifested or fine, being of the nature of the gunas.

Desires, actions and rewards are not only entwined with the cycle of time but are composed and hidden according to the rhythmic movement of sattva, rajas and tamas. They may manifest and be brought to the surface, or remain hidden and emerge later.

Bound to the wheel of time by the gunas, man started to form ideas fuelled by desires in the fire of consciousness. Then, through past actions and experiences, he began to mould his life in order to gain freedom from dualities. 

This involved time, which has no beginning or end, but is simply a succession of moments. Though each moment is eternal and real in its continuous flow, it changes into movement. To be free from the cycles of cause and effect, man has to mould his behaviour from moment to moment.

The cause is subtle but the effect is felt. The effects of our actions of yesterday are the cause of today's; and the experience of our actions today becomes the seed of our actions tomorrow. 

All actions revolve around time and the qualities of nature.

A yogi has learned to weaken ignorance and increase the light of knowledge. He has moved from ignorance to knowledge, and darkness to light, from death to immortality. He alone knows how to live freely, unaffected by the onslaughts of nature. This is kaivalya.

PATANJALI YOGA SUTRAS