Verse 89yasya kasyendriyasyāpi vyāghātāc ca nirodhataḥ ।
praviṣṭasyādvaye śūnye tatraivātmā prakāśate ॥Whoever blocks or obstructs one [or more] of the sense-organs may enter into the nondual Void—exactly there [the true nature of] the Self manifests.
Planning note: This guided practice is best done with an eye mask or blindfold, and noise-cancelling headphones.