“Ardently do today what must be done. Who knows? Tomorrow, death comes.” The Buddha
This is a genuine Buddha quote. It’s from the Sallekha Sutta.
“Meditate … do not delay, lest you later regret it.” The Buddha
“The world is afflicted by death and decay. But the wise do not grieve, having realized the nature of the world.” The Buddha (From the Sutta Nipata)
This is a genuine Buddha quote, from the Dhammapada:
Better it is to live one day seeing the rise and fall of things than to live a hundred years without ever seeing the rise and fall of things.