Kaivalya Pada:

4-17: An object is known or unknown depending on the degree to which the mind accepts it.

Kaivalya Pada 4:1 Siddhis are born of practices performed in previous lives, or of the ingestion of certain herbs, or by the repetition of certain mantras, or by pain-enduring tapasya(self-denial), or by samadhi (oneness with God)

Vibhuti Pada 3:30:

Samyama on the navel plexus gives knowledge of the body's constitution.

Discussing last three limbs of Ashtanga Yoga

Sadhana Pada: Verse 46

Asana (the third "limb" of Ashtanga Yoga) means to be seated in a firm, pleasant, and relaxed position.

Sadhana Pada: Verse 35:

In the presence of one who is firmly grounded in harmlessness, all hostilities cease.

Sadhana Pada: Verse 32 (contd.)

The Niyamas consist of purity, contentment, austerity (accepting but not causing pain), self-study (introspection), and openness to higher truths.

Sadhana Pada: Verse 32

The Niyamas consist of purity, contentment, austerity (accepting but not causing pain), self-study (introspection), and openness to higher truths.

Sadhana Pada: Verse 29

The eight limbs of yoga are 1, Yama (self-denial); 2, Niyama (observance); 3, posture; 4, withdrawal of the energy; 5, interiorization of the mind; 6, concentration; 7, meditation; 8, absorption

Sadhana Pada, Verse 19:

"The stages of the gunas are gross, less gross, definable, and beyond definition."

Back to the Gunas. Be it Patanjali or Krishna, the gunas are a central theme in both their expositions of this manifested world. So we must go deeper into it and see why exactly that is.