Verse
या निशा सर्वभूतानां तस्यां जागर्ति संयमी ।यस्यां जाग्रति भूतानि सा निशा पश्यतो मुनेः ॥
yā niśā sarvabhūtānāṃ tasyāṃ jāgarti saṃyamīyasyāṃ jāgrati bhūtāni sā niśā paśyato muneḥ
That (higher being) which is to all creatures a night, is to the self-mastering sage his waking (his luminous day of true being, knowledge and power); the life of the dualities which is to them their waking (their day, their consciousness, their bright condition of activity) is a night (a troubled sleep and darkness of the soul) to the sage who sees.
Gītā 2·69