But one reason I didn’t mention is that sometimes we lack peace because we knowingly sin against God. You can see this example in Genesis 4 when Cain offered a sacrifice that God did not receive. He instantly lacked peace. As Christians, this happens to us, as well. Conviction of sin can cause anxiety when we don’t repent. This is a kindness of God. It’s a way that He shows us that there’s a better way to live.