Philippians 3:13 KJV
Brethren, I count not myself to have apprehended: but this one thing I do, forgetting those things which are behind, and reaching forth unto those things which are before,
You can’t move forward in life while living in the past. Paul could not have been the apostle he became if he kept thinking of the people he persecuted and the mistakes he made. The only way to press on is to deal with the past and let it go. “Life can only be understood backwards; but it must be lived forwards” (Søren Kierkegaard).