Verse
अव्यक्तोऽयमचिन्त्योऽयम् अविकार्योऽयमुच्यते ।तस्मादेवं विदित्वैनं नानुशोचितुमर्हसि ॥
It is unmanifest, it is unthinkable, it is immutable, so it is described (by the Shrutis); therefore knowing it as such, thou shouldst not grieve.
Gītā 2·25