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.
|a chattering or flighty, light-headed person.|
|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|