Repeatedly I have heard (and previously used) this excuse in various forms to justify sinful actions. Often it comes across with apparent divine sanction: “I know that you don’t like what I am doing, but God has given me a real peace that this is right.” Individuals who say things like this are deceived. Most people do not consider themselves to be gullible, but Scripture makes it clear that we are. Jeremiah 17:9 says, “The heart is deceitful above all things, and desperately wicked: who can know it?” Solomon warns of trusting our own heart in Proverbs 28:26: “He that trusteth in his own heart is a fool…”
A sense of inner peace is not a reliable sign of God’s approval. Those desperate to justify their actions are quick to elevate “peace” to such a level that it overrules the clear teaching of Scripture itself. God often does give peace as we do His will, but it is not a conclusive sign because we have deceptive hearts.