tomorrow is another day

One may not accomplish everything today but will have another chance. For example, We've stuffed hundreds of envelopes and still aren't done, but tomorrow is another day. This comforting maxim was first put as Tomorrow is a new day about 1520, was widely repeated, and changed to its present form in the mid-1800s.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.