Vijnana Bhairava Tantra – 89

Train them inward

Yasya Kasyendriyasyaapi Vyaghathaccha Nirodhitha:|

Pravishtasyadvaye ShunyeTatraivatma Prakashate||

If the individual takes upp even one sense organ and restrains it from going repeatedly to its pastures, he enters into his own non-dual void within. The expression of the mind outward is brought within and there the atman shines in all its glory.

For instance, instead of allowing the eyes to roam around and getting tired watching different forms all the time, they can be kept closed. This allows the eye of contemplation to open within and there lies the discovery of the self. – SS