The conclussion of our study in I John ends with Last of Johns list of truths we can know without a doubt. While this is by no means a conclusive list it is a core list of fundamentals important to our faith:
The Bible is absolutely true
Jesus is the Son of God
Believers (as the Children of God) have eternal life
God hears our prayers.
And now 5th - While children of God do still sin, We do not keep on Sinning.