Let us prepare our minds as if we’d come to the very end of life. Let us postpone nothing. Let us balance life’s books each day. The one who puts the finishing touches on their life each day is never short of time.
Interestingly, "The Book of Mu" cites the following as a waka poem written by an old Japanese Zen Master.
When your bow is broken and your arrows are exhausted,
Shoot with your whole being!
-- The Book of Mu
While an internet search has the following line written by Roger Zelazny, an American writer of fantasy and science fiction short stories and novels.
When your bow is broken and your last arrow spent,
shoot with your whole heart.
-- Roger Joseph Zelazny