Bhagavad Gita: Chapter 2, Verse 69
Sanskrit Verse
या निशा सर्वभूतानां तस्यां जागर्ति संयमी।
यस्यां जाग्रति भूतानि सा निशा पश्यतो मुनेः।।2.69।।
Transliteration
yā niśhā sarva-bhūtānāṁ tasyāṁ jāgarti sanyamī
yasyāṁ jāgrati bhūtāni sā niśhā paśhyato muneḥ
Word meanings
yā—which; niśhā—night; sarva-bhūtānām—of all living beings; tasyām—in that; jāgarti—is awake; sanyamī—self-controlled; yasyām—in which; jāgrati—are awake; bhūtāni—creatures; sā—that; niśhā—night; paśhyataḥ—see; muneḥ—sage
Swami Sivananda's translation
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.
Chapter link: Gita Chapter 2

Muni's Play