“If you want to judge how well a person understands Christianity, find out how much he makes of the thought of being God’s child, and having God as his Father. If this is not the thought that prompts and controls his worship and prayers and his whole outlook on life, it means that he does not understand Christianity very well at all” (J. I. Packer).
“But to all who believed him (Jesus) and accepted him, he gave the right to become children of God” (John 1:12). “For you are all children of God through faith in Christ Jesus” (Galatians 3:26).
If he were asked, “What is a Christian?” Packer wrote, “The question can be answered in different ways, but the richest answer I know is that a Christian is one who has God for his Father.”
“You sum up the whole of New Testament teaching in a single phrase, if you speak of it as a revelation of the Fatherhood of the holy Creator. In the same way, you sum up the whole of New Testament religion if you describe it as the knowledge of God as one’s holy Father.”
“For everything that Christ taught, everything that makes the New Testament new, and better than the Old, everything that is distinctly Christian as opposed to merely Jewish is summed up in the knowledge of the Fatherhood of God. ‘Father’ is the Christian name for God” (J. I. Packer, Evangelical Magazine, 7, p.19 f.).