1 John 5:5

5Who is he that overcometh the world This is a reason for the previous sentence; that is, we conquer by faith, because we derive strength from Christ; as Paul also says,

“I can do all things through him that strengtheneth me,”
(Philippians 4:13.)

He only then can conquer Satan and the world, and not succumb to his own flesh, who, diffident as to himself, recumbs on Christ’s power alone. For byfaith he means a real apprehension of Christ, or an effectual laying hold on him, by which we apply his power to ourselves.