It is not as important how we start (our past), but how we finish.
Anger is the fruit of rotten roots.
We cannot control what others do to us, but through God we can control the way we respond to them.
Wisdom is exercised in the choices you make.
Just deciding to forgive isn't enough because willpower alone won't work - we need divine strength from God. As He gives us the strength, we need to pray for our enemies and bless them. Praying for those who have hurt us is vital to successfully forgiving them.
Your fellowship with God flows freely when you're willing to forgive, but it gets blocked by unforgiveness.