It was Benjamin Franklin who wrote, in 1789, that in this world, nothing can be said to be certain, except death and taxes.
Although it may be true that there are few things on earth that we can truly be certain about, or place our confidence in, this is rather a depressing view of the world, especially when we consider the fact that if we put our confidence in the Lord, we will never be disappointed!
There are many things that are certain about God things that we can be completely confident about. John covers three of them in this chapter.
Firstly, we can be confident that God has overcome the world, and that, if we believe that Jesus is the Son of God, we, too, can overcome the world!
Secondly, we can be confident that God has given us eternal life in his Son, Jesus, and if we have Jesus, we have life. God, himself, provides testimony to the truth of this.
Thirdly, we have the confidence to approach God, knowing that if we ask anything according to his will, he will hear us and we will have it.
These are certainties, and they are worth putting our confidence in. We have victory, we have life, and we have access to God himself. While sin is everywhere, and the evil one holds sway over the world, our confidence is in God, who has given us the means to know him and receive salvation. As John says, He is the true God and eternal life.