What does this mean Yesterday's history tomorrow a Mystery today is a gift?

No gift for what you can do today, but a gift for whatyou do in the future

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I believe it means that yesterday was history, so don't waste all today worrying about the possible mistakes you may have made yesterday. "Tomorrow is a mystery" means that you don't know what will happen tomorrow or how long we have here etc so enjoy what we have today since we have it. "Today is a gift" means that you should be thankful for today and live it to the fullest as it truly is a gift.

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this is a Word-game with the grammar terms past - present - future:

yesterday is history = past

tomorrow is a mistery = future

today is a gift = present

a hug