Verse
नासतो विद्यते भावो नाभावो विद्यते सतः ।उभयोरपि दृष्टोऽन्तस् त्वनयोस्तत्त्वदर्शिभिः ॥
That which really is, cannot go out of existence, just as that which is non-existent cannot come into being. The end of this opposition of ‘is’ and ‘is not’ has been perceived by the seers of essential truths.
Gītā 2·16