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.
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1 John 3:1-3
Tyndale Open Study Notes (CC BY-SA 4.0).
3:1-3 When Christ returns, we will be like him, for we will see him as he really is. God’s children bear the image of Christ and will share in his glory (see Rom 8:18-30). • Those who have this hope keep themselves pure, seeking to become more like Christ in anticipation of his glorious appearing. It is partly for this reason that God’s children will not be ashamed when Christ comes (1 Jn 2:29).
Other Bible passages linked to this one, most cited first.
But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:
For ye are all the children of God by faith in Christ Jesus.
And will be a Father unto you, and ye shall be my sons and daughters, saith the Lord Almighty.
To redeem them that were under the law, that we might receive the adoption of sons. And because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father.
For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
O righteous Father, the world hath not known thee: but I have known thee, and these have known that thou hast sent me.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.