Notes from 2 John 1:3, 4
The "truth" is the truth about Jesus Christ, as opposed to the lies of the false teachers (see 1 John 2:21-23). John refers to truth five times in the first four verses of this brief letter. In contrast to so many in our culture who dogmatically deny truth ("There are no ultimate realities") or absurdly define it according to personal preference ("Your truth is your truth and my truth is my truth"), John declared the existence of an Absolute. God is that ultimate standard by which all else can be judged. God is true, his words and ways are true, and whatever or whoever contradicts or opposes him is false, deceptive, and dangerous. Christian leaders, teachers, and parents must engage now in the difficult but critical battle for truth. To paraphrase a familiar saying: "All that is required for Deception to triumph is for the people of the Truth to do nothing." Begin an intentional campaign to teach those under your care how to distinguish between truth and error.
Notes from Hebrews 7:25
No one can add to what Jesus did to save us; our past, present, and future sins are all forgiven, and Jesus is with the Father as a sign that our sins are forgiven. As our High Priest, Christ is our Advocate, the mediator between us and God. He looks after our interests and intercedes for us with God. The Old Testament high priest went before God once a year to plead for the forgiveness of the nation's sins; Christ makes perpetual intercession before God for us. Christ's continuous presence in heaven with the Father assures us that our sins have been paid for and forgiven (see Romans 8:33, 34; Hebrews 2:17, 18; 4:15, 16; 9:24). This wonderful assurance frees us from guilt and from fear of failure. If you are a Christian, remember that Christ has paid the price for your sins once and for all (see also 9:24-28).
Notes from 1 John 5:12
Whoever believes in God's Son has eternal life. He is all you need. You don't need to wait for eternal life because it begins the moment you believe. You don't need to work for it because it is already yours. You don't need to worry about it because you have been given eternal life by God himself--and it is guaranteed.
Notes from 1 John 5:13
Some people hope that they will receive eternal life. John says we can know we have it. Our certainty is based on God's promise that he has given us eternal life through his Son. This is true whether you feel close to God or far away from him. Eternal life is not based on feelings but on facts. You can know that you have eternal life if you believe God's truth. If you aren't sure that you are a Christian, ask yourself: Have I honestly committed my life to him as my Savior and Lord? If so, you know by faith that you are indeed a child of God.