Yoga Sutra 3.21 samyama on the form of the body
Sūtra III.21
From saṃyama on the form of the body, its potentiality of being seen is nullified. Being disjoined from the light of the eye, it disappears
From saṃyama on the form of the body, its potentiality of being seen is interrupted. When it is thus nullified, the body is disjoined from the light of the eye, and the yogin disappears. Similarly it is implied that he disappears from the field of other sense perceptions such as sound.
From saṃyama on the form of the body, its potentiality of being seen is nullified. The form of the body refers to the yogin’s own body, its potentiality of his body of being seen by the eyes of others is nullified, interrupted, is inhibited. As a result, the light of the eye of others is not in contact with the form of the body of the yogin, and the yogin disappears. Similarly it is implied that he disappears from the field of other sense perceptions such as sound. There is a power of hearing the yogin, and when this saṃyama is made on the sound, that power is nullified and so another person does not hear him. So it is to be understood in the case of touch and the other senses.