This is the last of three passages to memorize which promise us the gift of forgiveness.
I John 2:1,2 My little children, these things I write to you, so that you may not sin. And if anyone sins, we have an Advocate with the Father, Jesus Christ the righteous. And He Himself is the propitiation for our sins, and not for ours only but also for the whole world.
Propitiation means to appease or satisfy the wrath of God with some sort of offering or sacrifice. Jesus Christ did just that for us on the cross.
Have a good week.
