I often use phrases such as "Set your baggage down and walk on." Another is "Keep your eye on where you're going rather than where you have been." Nice little gems, but alone they leave many unanswered questions. Whether we like it or not, yesterday and actions associated with yesterday must be accounted for.
Charles Kettering said, "You can't have a better tomorrow if you are thinking about yesterday all the time." He was correct. But is there any valid way to deal with, to do away with yesterday? Yes, there is a valid means. The means is Jesus Christ.
In scripture we are bombarded with the truth of an old song, "God took away my yesterdays." We are told to forget the past and focus on what things are before. We are to persistently run the race of life looking unto, ahead, to Jesus. Every runner knows not to look back, but to keep our eye on the prize. One way to rid your mind and heart of yesterday is trust the truth of scripture and come to a deep understanding of what is said.
One of my all-time favorites is 2 Corinthians 5:17 "Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new." That which is new has never been. The Amish explain, "That which is forgiven has never been." Christ deals effectively with yesterday.