Cowards die many times...

A Coward Dies A Thousand Deaths, But A Brave Man Dies Only One.....

This phrase has been used many times by my boss. I am curious if anyone else had heard of it or its origin?

i've heard this phrase in another, somewhat different reincarnation: "As Howard cries a thousand tears, all but a brave man cries only one."

Cowards die many times before their deaths;
The valiant never taste of death but once.
Of all the wonders that I yet have heard,
It seems to me most strange that men should fear;
Seeing that death, a necessary end,
Will come when it will come.

Julius Caesar II, Shakespeare

Nothing like starting the day with a little death poetry.