The words of Christ found in this verse are among those that are most cherished in the gospel of John. Throughout this statement, we find teaching, remembrance, warnings, and encouragement. It is imperative to note that becoming a Christian does not guarantee an easy life. Born-again Christians are joyous because they know that Christ has already achieved ultimate victory, and nothing in this world can undo it. 
This was the most challenging event in the history of the universe for the Lord Jesus. Despite this, He managed to convey His message to His confused and fearful followers. They were moderated by the gracious words of comfort our Savior uttered on the day of salvation. Those words of comfort and succor were written to provide reassurance and support, strength, hope, and courage to the disciples and to those generations who had trusted in Christ as a Savior.
There is no doubt that He has overcome the system of the world, the power of the flesh, and the wiles of Satan. He paid for His sins and broke the old sin nature, which had imputed sin to the entire human race via Adam's inheritance. The power of death and hell was broken by Him. Because of this, God's amazing grace was demonstrated in a cascade of riches upon all who believed in His name.

Dear Heavenly Father, You have provided me with such comfort and peace with your wonderful words. May my heart and mind be strengthened by Jesus in the midst of all the trials and tribulations of life, which seem to increase with each passing day. Thank You that the world has been overcome by Him, so I have nothing to fear. The victory of His is the victory of my soul, simply because I put my faith in Him as my Savior. In Jesus's name I pray. Amen.