Main Point: Followers of Jesus Christ can live life with no uncertainty.
Know for sure that we have eternal life (13).
The test of life: believe, love, obey
Know for sure that God answers prayer (14-17).
C. H. Dodd, “Prayer rightly considered is not a device of imploring the sources of God to fulfill our desires, but a means by which our desires may be redirected according to the mind of God and made into the channels for his will.”
Know for sure that we have victory over sin (18).
Know for sure that we belong to God (19).
Know for sure what is true (20-21).
Application: Keep yourself from not knowing for sure.