Who is he that overcometh the world, but he that believeth that Jesus is the Son of God? This is he that came by water and blood, even Jesus Christ; not by water only, but by water and blood. And it is the Spirit that beareth witness, because the Spirit is truth.
1 John 5:5-6 KJV
The question is the answer.
The overcomer of the world is the person who believes that Jesus is the Son of GOD. In believing so, the individual also believes that GOD sent His Son to the earth to die and resurrect and ascend the heavens in the bid to prepare a place for those who believe even without the urge to see.
This simple link is everything. Believing in Jesus, as son of GOD, gives you power to adopt salvation as a way of life and overcome the power of sin, which is the power of the world. Overcoming the power of the world…overcomer.
It’s an honour to believe that Jesus didn’t only come with water to wash sin but blood to save thus the crucifixion. But it is the Holy Spirit who strengthens us in this truth that belief is connection and connection is the overcoming power.