1 John 2:1-2 My little children, I am writing these things to you so that you may not sin. But if anyone does sin, we have an advocate with the Father, Jesus Christ the righteous. 2 He is the propitiation for our sins, and not for ours only but also for the sins of the whole world.
The Apostle John is possibly 80 years old as he writes this letter to young Christians he views as his little children. He knows that they have been equipped with everything they need to not sin, but that they may have lapses and not use the resources of the Christ living in them. We use the resources we have been given by exercising faith in Jesus, that is, attempting to obey the truth expecting Jesus to fulfill our attempt with His power.
The Apostle is aware of the tendency for Christians to sin and instructs each believer how to be restored when he does sin. We are restored by confessing our sins to the Lord and trusting to be forgiven because our Advocate, Jesus, has paid the penalty for our sins by His death on the cross. He is the eternal propitiation for our sins and the sins of the world. Propitiation means that He paid the penalty for our sins and bought us a pardon from eternal torment, the just penalty for sin. Paul writes in Hebrew 7:25 that Jesus always lives to make intercession for us. When we sin and deserve the penalty for sin, He pleads our case at the bar of judgment and wins us pardon – He intercedes for us.
Jesus offers to be the Advocate for any person in the world. All people in the world have sinned (Romans 3:23) and need an Advocate to win them pardon, but not all people take Jesus up on His offer. People who repent of their sins and believe the gospel have received pardon from their sins and can be restored to fellowship with God by their Advocate, Jesus Christ, by confessing their sins and receiving His forgiveness from all unrighteousness. When we, as believers in Christ sin and regret our sin, we can get back right with God the moment we confess our sin. To be pardoned and forgiven is a gift from God that grows more valuable to us every year we live in this sinful world. We never need to stay alienated from the One who loves us the most.