He that hath ears to hear, let him hear (Matthew 11:15).

That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked upon, and our hands have handled, of the Word of life; (For the life was manifested, and we have seen it, and bear witness, and shew unto you that eternal life, which was with the Father, and was manifested unto us;) That which we have seen and heard declare we unto you, that ye also may have fellowship with us: and truly our fellowship is with the Father, and with his Son Jesus Christ. If we say that we have no sin, we deceive ourselves, and the truth is not in us. 

If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness. If we say that we have not sinned, we make Him a liar, and His word is not in us. "Dearly beloved, these things write we unto you, that if ye are convicted of sin," we have an advocate with the Father, Jesus Christ the righteous: And He is the propitiation for our sins: and not for ours only, but also for the sins of the whole world. Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son. Whosoever denieth the Son, the same hath not the Father: (but) he that acknowledgeth the Son hath the Father also. And this is the promise that he hath promised us, even eternal life. And ye know that he was manifested to take away our sins; and in him is no sin. 

And this is his commandment, That we should believe on the name of his Son Jesus Christ. In this was manifested the love of God toward us, because that God sent his only begotten Son into the world, that we might live through him. Herein is love, not that we loved God, but that he loved us, and sent his Son to be the propitiation for our sins. And we have seen and do testify that the Father sent the Son to be the Saviour of the world. Whosoever shall confess that Jesus is the Son of God, God dwelleth in him, and he in God. Whosoever believeth that Jesus is the Christ is born of God. 

For whatsoever is born of God overcometh the world: and this is the victory that overcometh the world, evenour faith. Who is he that overcometh the world, but he that believeth that Jesus is the Son of God? If we receive the witness of men, the witness of God is greater: for this is the witness of God which he hath testified of his Son. He that believeth on the Son of God hath the witness in himself: he that believeth not God hath made him a liar; because he believeth not the record that God gave of his Son. And this is the record, that God hath given to us eternal life, and this life is in his Son. He that hath the Son hath life; and he that hath not the Son of God hath not life.

And we know that the Son of God is come, and hath given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son Jesus Christ. This is the true God, and eternal life.