Chapter 2 · verse 69 · gita.yoga.org
Bhagavad Gita 2.69
या निशा सर्वभूतानां तस्यां जागर्ति संयमी। यस्यां जाग्रति भूतानि सा निशा पश्यतो मुनेः
That which is night to all beings, in that the self-controlled man is awake; when all beings are awake, that is night for the sage who sees.