नासतो विद्यते भावो नाभावो विद्यते सतः | उभयोरपि दृष्टोऽन्तस्त्वनयोस्तत्त्वदर्शिभिः ||
Nasato vidyate bhavo
The unreal has no existence, and the real never ceases to be. The truth of both has been seen by the wise.
Modern Application: Truth is eternal; illusion is temporary.
Deep Wisdom: Krishna distinguishes between real (soul) and unreal (body). Understanding this is key to wisdom.