(See also )

Life is what happens to you while you are making other plans.
unknown

You pile up enough tomorrows, and you'll find you've collected a lot of empty yesterdays.
Professor Harrold Hill
(The Music Man)

If not me, Who?
If not now, When?
unknown

Tomorrow is often the busiest day of the week.
unknown

The biggest labor problem is tomorrow
Brigham Young

Yesterday is but a dream, and tomorrow is only a vision, but today well lived makes every yesterday a dream of happiness and
every tomorrow a vision of hope.
unknown

What would be the use of immortality to a person who cannot use well a half an hour.
Ralph Waldo Emerson

You may delay, but time will not.
Benjamin Franklin

Lost time is never found again.
Benjamin Franklin

Dollars can not buy yesterday.
Admiral Harold R. Stark