NET
1 (See what sort of love the Father has given to us: that we should be called God’s children—and indeed we are! For this reason the world does not know us: because it did not know him.
Darby
1 See what love the Father has given to us, that we should be called [the] children of God. For this reason the world knows us not, because it knew him not.
KJV
1 Behold, what manner of love the Father hath bestowed upon us, that we should be called the sons of God: therefore the world knoweth us not, because it knew him not.