The unreal never is. The Real never ceases to be. The conclusion about these two is truly perceived by the seers of Truth.
BG 2.16
That by which all this is pervaded know to be imperishable. None can cause the destruction of that which is immutable.
BG 2.17
It is never born, nor does It ever die, nor, having once been, does It again cease to be. Unborn, eternal, permanent, and primeval, It is not slain when the body is slain.
BG 2.20
Weapons cut It not; fire burns It not; water wets It not; the wind does not wither It.
BG 2.23
This Self is said to be unmanifest, incomprehensible, and unchangeable. Therefore, knowing It to be so, you should not grieve.
BG 2.25
Some look on the Self as a wonder; some speak of It as a wonder; some hear of It as a wonder; still others, though hearing, do not understand It at all.
BG 2.29
~selections from The Bhagavad Gita as translated by Swami Nikhilananda