1 John 5:1

"Everyone who believes that Jesus is the Christ is born of God, and everyone who loves the father loves his child as well." NIV translation

John begins by showing us that our faith is an exclusive faith in that it all comes down to Jesus being the Son of God and Savior of the world. Although this is not popular today, there is only one faith that accomplishes anything and that is Jesus. There are many that say they love God but reject His Son (Jesus) but, as we see here, that is not possible.

1 John 5:2

"This is how we know that we love the children of God: by loving God and carrying out his commands." NIV translation

We show our love to God by obeying Him and He has called us to love others. Therefore, we demonstrate our love for Him by loving those people that are around us. When asked what the greatest commandment was, Jesus answered that it was to love God and love your neighbor. That is what John is stating here as well.

1 John 5:3 & 4

"This is love for God: to obey his commands. And his commands are not burdensome, for everyone born of God overcomes the world. This is the victory that has overcome the world, even our faith." NIV translation

If we love God, we will not want to disappoint Him with our words and actions. That is why we obey His commands and they are "not burdensome". God is right in everything that He says and does and so His commands are the right things to do as well. Overcoming the world speaks to the fact that we are no longer defeated and controlled by our enemy which is threefold: the world, the flesh, and the devil. This is the only time that the word "victory" occurs in the New Testament and we are told that it only comes through our faith in Jesus.