या निशा सर्वभूतानां तस्यां जागर्ति संयमी। यस्यां जाग्रति भूतानि सा निशा पश्यतो मुनेः ॥

yā niśhā sarva-bhūtānāṁ tasyāṁ jāgarti sanyamī yasyāṁ jāgrati bhūtāni sā niśhā paśhyato muneḥ

That which is the night of all beings, for the disciplined man is the time of waking; when other beings are waking, then is it night for the sage who seeth.

In plain words: What ordinary people ignore, as if asleep, is what the wise person stays awake to. And the things ordinary people are wide awake for seem like darkness to the wise person who truly sees.