I've been reading a couple of books by Max Lucado and here is a quotable quote from "Every Day Deserves A Chance"

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You no longer have yesterday.

It slipped away as you slept. Itis gone. You’ll more easily retrieve a puff of smoke. You can’tchange, alter, or improve it. Sorry, no mulligans allowed.
Hourglass sand won’t flow upward. The second hand of the
clock refuses to tick backward. The monthly calendar reads
left to right, not right to left. You no longer have yesterday.


You do not yet have tomorrow.

Unless you accelerate the orbit
of the earth or convince the sun to rise twice before it sets
once, you can’t live tomorrow today. You can’t spend tomorrow’s
money, celebrate tomorrow’s achievements, or resolve
tomorrow’s riddles. You have only today. This is the day the
Lord has made.
Live in it. You must be present to win. Don’t heavy today
with yesterday’s regrets or acidize it with tomorrow’s troubles.