1 John 5:4

for everyone born of God overcomes the world. This is the victory that has overcome the world, even our faith.

(v4, NIV)

This verse begins with the word "for", linking it with the last verse. Love for God is obeying his commands. With regards to his commands, they are not burdensome. When you're carrying a huge load, the weight is burdensome while you're carrying it. It weighs you down and it is a hindrance while you're carrying it. But when you finally reach the place where you can put it down, it's not burdensome. Even while you're carrying it, maybe you're confident that you can carry it all the way. Maybe you know you've done it before or maybe someone who is weaker than you has carried it the same distance yesterday and you know you can do it with reference to him. Maybe someone's helping you carry the load, so it isn't as lonely or all on you. His commands are not burdensome and we can look forward to this overcoming and this victory at the end.

I don't like it when people ruin the ending for me. I'm sure a lot of people are the same and don't like it when someone spoils the story for you. Well, here's a spoiler alert: those who are born of God win in the end through victory in Christ. Sorry to ruin the ending, but that's what happens; everyone born of God overcomes the world. Knowing the ending and seeing the finish line ahead of us, following his commands is that much less burdensome. Of course we are carrying them out through this loving relationship we have for God. However, this is just another aspect as to why it is not burdensome.

At the beginning of this chapter, John established that those who believe that Jesus is the Christ are born of God. Now he is saying that everyone who is born of God overcomes the world. Since those born of God are also those who believe that Jesus is the Christ, it is easy to relate the next statement, which is about faith. This victory is through our faith in the Lord Jesus Christ.