1 John 3:1
See how great a love the Father has bestowed on us, that we would be called children of God; and such we are.
In this passage, John tells us to look at "how great" a love the Father has given us. We are commanded to think about His love, especially on the type of love. We must consider how great the love of God for His children really is. When the Spirit of God opens the eyes of the sinner's heart to see this love, pure and unadulterated, then the sinner's heart is captured by this kind of love. This, "how great" love of God.