Bro Eli teaches us that forgiveness is something we should practice and is very important in our life. God said we should forgive those who wrong us just a he forgive us when we wrong him too. When we talk about forgiveness, we are not saying you should just leave the person but also remove the grudges in your mind. Forgiveness is all about forgive and forget what happen. When we forgive those who wrong us it means we're showing the reflection of God's kindness heart on how he forgive us when we commit sin.
If you forgive and forget it means you should not use the past against those people that worng you to punish them. When we sin and God forgives us he doesn't use our past sin against us to punish us he accepts our apologies when we ask for forgiveness. This shows that we should forgive others when they apologize to us, we we must not use it to push them later.