Bhagavad Gita 2.25 Chapter 2, Verse 25

अव्यक्तोऽयमचिन्त्योऽयमविकार्योऽयमुच्यते ।
तस्मादेवं विदित्वैनं नानुशोचितुमर्हसि ॥२.२५॥

avyakto'yamacintyo'yamavikāryo'yamucyate
tasmādevaṃ viditvainaṃ nānuśocitumarhasi

Meaning

The soul is said to be unmanifest, beyond thought and unchanging. Knowing it to be so, you should not grieve.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 2.25 (Chapter 2, The Yoga of Knowledge (Sankhya Yoga), Verse 25)