Therefore, if you are offering your gift at the altar and there remember that your brother has something against you, leave your gift there in front of the altar. First go and be reconciled to your brother; then come and offer your gift.
I can remember the first time that the teaching of the verse made sense to me. I would summarize it by saying this, "In order to be right with God, you need to be right with your neighbor."
So that I won't get too wordy on this post, allow me to refer you to this other post that deals with this verse. And then let me encourage you with this: If you know of someone that you have wronged, make it right today. Don't let another moment go by that must go by. Make things right with the people around you, so that you can be right with your creator.