Be in charity with all
But that your prayer may have its full weight with God, see that you are in charity with all men. For otherwise, it is more likely to bring a curse than a blessing on your own head: nor can you expect to receive any blessing from God while you have not charity toward your neighbor. Therefore let this hindrance be removed without delay. Confirm your love toward one another and toward all men. And love them, not in word only, but in deed and in truth (1 John 3:18). Therefore all things whatever you would have men do to you, do even so to them: for this is the law and the prophets (Matthew 7:12).
1771 text
21. But that your prayer may have its full weight with God, see that ye be in charity with all men. For otherwise, it is more likely to bring a curse than a blessing on your own head: nor can you expect, to receive any blessing from God, while you have not charity towards your neighbour. Therefore let this hindrance be removed without delay. Confirm your love towards one another and towards all men. And love them, not in word only, but in deed and in truth. Therefore all things whatsoever ye would, that men should do to you, do ye even so unto them: for this is the law and the prophets.