1 John 1:2 (For the life was manifested, and we have seen it, and bear witness, and show to you that eternal life, which was with the Father, and was manifested to us;)
Gnosticism, influenced by such philosophers as Plato, advocated a dualism asserting that matter was inherently evil and spirit was good. As a result of this presupposition, these false teachers, although attributed some form of deity to Yeshua, denied His true humanity to preserve Him from evil. It also claimed elevated knowledge of truth known only to those in on the deep things. Only the initiated had the mystical knowledge, a higher truth that was higher than the Scripture.
1 John 1:3 That which we have seen and heard declare we to you, that you also may have fellowship with us: and truly our fellowship is with the Father, and with His Son Yeshua HaMashiach.
G-d wants all to be in fellowship with us; however, all have a free choice. G-d was not going to let even some(it may even be a family member) decision not to accept Him to come in the way of His plan for those that do.
1 John 1:4 And these things write we to you, that your joy may be full (complete).
The Word is given so we may become complete. The joy of knowing our Messiah is beyond all comprehension.
1 John 1:5 This then is the message, which we have heard of Him, and declare to you, that G-d is light, and in Him is NO darkness at all.
There is no darkness or EVIL in G-d at all. Light and darkness cannot coexist. Again John is refuting the teaching of dualism.
Light refers to “biblical truth” and “darkness” refers to falsehood.
1 John 1:6 If we say that we have fellowship with Him, and walk in darkness, we lie, and do not the truth:
If one declares to follows Him and continues in evil or darkness, this one may be lying about being in fellowship with Him and can be a sign of their lack of genuine (eternal) salvation.
1 John 1:7 But if we walk in the light, as He is in the light, we have fellowship one with another, and the blood of Yeshua HaMashiach His Son cleanses us from all sin.
A genuine follower of Yeshua walks in the light (truth and holiness) indicating their relationship with Yeshua.
We also see here that our sins are erased by Yeshua’s shed blood not by any self-righteousness.
1 John 1:8 If we say that we have no sin, we deceive ourselves, and the truth is not in us.
The false teachers of the day denied the sin nature. If a person will not admit that they are a sinner they cannot be saved.
Admitting that you are a sinner is the first step in the salvation process.
In this life we are all sinners from birth. David said, “In sin did my mother conceive me.”
Psalm 51:5 Behold, I was shapen in iniquity; and in sin did my mother conceive me
1 John 1:9 If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.
We must confess our sins in order to obtain forgiveness of sin.1 John 1:10 If we say that we have not sinned, we make Him a liar, and His word is not in us.
Matt 5:48 Be therefore perfect, even as your Father which is in heaven is perfect.
No one is perfect. This is the problem with us all, and what G-d had to deal with. He loves us but hates the sin in our lives. If you have one rotten egg it will ruin the whole omelet. The same can be said of us. There are two kinds of sin. If one sinned three times a day that would lead to ninety sins a month or nine hundred every ten months. If one was a very good person that person could still not be good enough to make up for their sin. This also only takes into account things we shouldn’t do there are also things called sins of omission- things we should do and don’t. We all fall short of the glory of G-d.
So here we see a summary by John on how to obtain eternal life and become complete. Be therefore complete as even your Father in heaven is complete.