Bhagavad Gītā Chapter Two verse 69

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

yā niśā sarvabhūtānāṃ tasyāṃ jāgarti saṃyamī |
yasyāṃ jāgrati bhūtāni sā niśā paśyato muneḥ ||

sarva - whole, entire, all, every one; altogether, wholly, completely, in all parts, everywhere

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.”