Bhagavad Gītā Chapter Two verse 69

या निशा सर्वभूतानां तस्यां जागर्ति संयमी ।
यस्यां जाग्रति भूतानि सा निशा पश्यतो मुनेः ॥ ६९ ॥

yā niśā sarva-bhūtānāṃ tasyāṃ jāgarti saṃyamī |
yasyāṃ jāgrati bhūtāni sā niśā paśyato muneḥ ||

niśā - night; a vision, dreamsarva - whole, entire, all, every one; altogether, wholly, completely, in all parts, everywherebhūta - material element, one of the 5 elements; that which is or exists, any living being; being or being like anything, consisting of, mixed or joined withtasya - its, of it, of thissaṃyama - complete restraintpaśyantī - Name of the second out of the four successive stages in the origination or utterance of a word. Thence it comes up and is called madhyamā in the third stage; when it strikes against the vocal chords it becomes articulate, then it is called vaikharī.muni - a saint, sage, seer, ascetic, monk, devotee, hermit

Commentaries and Reflections

Commentary by TKV Desikachar:

“What is darkness for some people is light for others.
What is light for some people is darkness for others.”