sāṃkhyayoga - Verse śloka 69
śloka 69
yā niśā sarvabhūtānāṃ tasyāṃ jāgarti saṃyamī |
yasyāṃ jāgrati bhūtāni sā niśā paśyato muneḥ ||2-69||
Translation
That which is night for all beings, in that the self-controlled man is awake; and that wherein all beings are awake, that is night for the sage who sees the Reality.