Bhagavad Gita -
You grieve for those who are not worthy of grief, and yet speak the words of wisdom.
The wise grieve neither for the living nor for the dead. (2.11)
There was never a time when I, you, or these kings did not exist;
nor shall we ever cease to exist in the future. (2.12)
Know That, by which all the universe is pervaded, to be indestructible.
No one can destroy the indestructible (Brahman or Atman). (2.17)
Bodies of the eternal, imperishable, and incomprehensible soul are said to be perishable.
Therefore, fight, O Arjuna! (2.18)
Both are fools, who think that Atma is a slayer, and that Atma is slain,
for Atma neither slays nor is slain. (2.19)
The Atma is neither born nor does it die, nor having been, it will cease to exist again.
It is unborn, eternal, and primeval. The Atma is not destroyed when the body ends. (2.20)
Death is as certain for the born, as birth is for the dead.
Therefore, do not grieve for the inevitable. (2.27)
Taoism -
The tao that can be told
is not the eternal Tao
The name that can be named
is not the eternal Name.
The unnamable is the eternally real.
Naming is the origin
of all particular things.
Free from desire, you realize the mystery.
Caught in desire, you see only the manifestations.
Yet mystery and manifestations
arise from the same source.
This source is called darkness.
Darkness within darkness.
The gateway to all understanding.