The constant recollection of death is the test of human conduct.
Nothing can come out of nothing, any more than a thing can go back to nothing.
Stop whatever you're doing for a moment and ask yourself: Am I afraid of death because I won't be able to do this anymore?
Why should any of these things that happen externally distract thee? Give thyself leisure to learn some good thing: cease roving to and fro.
The universe is a single life comprising one substance and one soul.
A person's life is what their thoughts make it.