King James Version
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.English Standard Version
See what kind of love the Father has given to us, that we should be called children of God; and so we are. The reason why the world does not know us is that it did not know him.Catholic Public Domain Version
See what kind of love the Father has given to us, that we would be called, and would become, the sons of God. Because of this, the world does not know us, for it did not know him