Don’t approach today wearing yesterday’s glasses.
Yesterday is gone. There is nothing we can do to change what we did or didn't do. It's a waste of time to worry about it. And we should never approach today with yesterday's glasses. Wear today's glasses. Be in the present and think only forward.
If you let the worries, thoughts and actions of yesterday get in the way of today, you again lose precious time dwelling in the past. Our time here is short, approach it from today, and enjoy it.