O mighty Arjuna, even if you believe the Self to be subject to birth and death, you should not grieve. Death is inevitable for the living; birth is inevitable for the dead. Since these are unavoidable, you should not sorrow. Every creature is unmanifested at first and then attains manifestation. When its end has come, it once again becomes unmanifested. What is there to lament in this?
-Bhagavad Gita
The bottom of the river is full of jewels.
Take heed! Do not make the water turbid.
The spirit of man is like the air:
when dust surrounds it the sky is veiled.
Notwithstanding such a state of darkness,
God made visions to help you
find the road to redemption.
-Rumi
As a heavily laden cart creaks as it moves along, the body groans under its burden when a person is about to die. When the body grows weak through old age or illness, the Self separates himself as a mango or fig or banyan fruit frees itself from the stalk, and returns the way he came to begin another life.
-Brihadaranyaka Upanishad
Come unto me ALL you who are heavy laden and I will give you rest. Take MY yoke upon you and learn of me, for my yoke is easy and my burden is light.
-Matthew 11:28