Assemble on the Lord’s day, and break bread and offer the Eucharist; but first make confession of your faults, so that your sacrifice may be pure. Anyone who has a difference with his fellow is not to take part until he has been reconciled, so as to avoid profaning your sacrifice [Mt 5:23–24]. For this is the offering of which the Lord said, “Everywhere and always bring me a sacrifice that is undefiled, for I am a great king, says the Lord, and my name is the wonder of nations” [Mal 1:11, 14].

When You Have An Evil Thought, Do This! | St. Alphonsus Liguori
"When an evil thought is presented to the mind, we must immediately endeavor to turn our thoughts to God, or to something which is indifferent. But the first rule is, instantly to invoke the names of Jesus and Mary and to continue to invoke them until the temptation...