He that believes on the Son of God has the testimony in him self: he that believes not God, has made him a liar, because he has not believed the testimony which God has borne concerning his Son.

whenever our heart convicts us [in guilt]; for God is greater than our heart and He knows all things [nothing is hidden from Him because we are in His hands].

If we claim to have no sinful practices [in our lives], we are self-deceived and are not being truthful about the matter.

(and the life was made known, and we have seen, and testify, and declare to you the eternal life that was with the Father, and was made known to us),

Beloved, now we are children of God, and it is not yet made known what we will be. But we know that whenever he is made known we will be like him, because we will see him as he is.