As we are almost finished with John, I wonder what the purpose of the book was. It says in the chapter:

31 But these are written that you may believe that Jesus is the Messiah, the Son of God, and that by believing you may have life in his name.

It attributes Jesus to 2 titles: the Messiah and the Son of God. These 2 identities of Jesus  are emphasized throughout the book. For the whole book, Jesus has been reiterating the point that in order to be saved (Messiah), one must believe that Jesus is the Son of God. 

In John 3:36, it says

Whoever believes in the Son has eternal life, but whoever rejects the Son will not see life, for God’s wrath remains on them.

Believing and acknowledging with all your heart that Jesus is God’s perfect son that was sacrificed out of Love is crucial to having a relationship with God. One can study the whole Bible, but if he or she does not understand that their relationship with God (an adopted child) was made possible only through the blood sacrifice of Jesus Christ, then all the knowledge would be useless.

I pray that this Truth, that Jesus is the Son of God and the Messiah who saved me from the sin of the World, will be forever engrained in my heart so that even when I become lost, I will still hold on to that truth.