God made death so we'd know when to stop

As a well-spent day brings happy sleep, so a life well used brings happy death. - Leonardo da Vinci
On a large enough time line, the survival rate for everyone will drop to zero. - Chuck Palahniuk, Fight Club
God made death so we'd know when to stop. - Steven Stiles
Now he has departed from this strange world a little ahead of me. That signifies nothing. For us believing physicists the distinction between past, present, and future is only a stubbornly persistent illusion. - Albert Einstein
There is only one ultimate and effectual preventive for the maladies to which flesh is heir, and that is death. - Harvey Cushing
A dying man needs to die, as a sleepy man needs to sleep, and there comes a time when it is wrong, as well as useless, to resist. - Stewart Alsop