“The thought of the Fatherhood of God was not altogether new. He had claimed “Israel as His son, even His firstborn” (Exodus 4:22), had loved him as His child (Jeremiah 31:9; Hosea 11:1). The thought of an outraged Fatherhood underlies the reproaches of Isaiah (Isaiah 1:2) and Malachi (Malachi 1:6). “Thou, O Lord, art our Father” (Isaiah 64:8) was the refuge of Israel from despair. It had become common in Jewish liturgies and forms of private prayer. As the disciples heard it, it would not at first convey to their minds thoughts beyond those with which they were thus familiar. But it was a word pregnant with a future. Time and the teaching of the Spirit were to develop what was now in germ. That it had its ground in the union with the Eternal Son, which makes us also sons of God; that it was a name that might be used, not by Israelites only, but by every child of man; that of all the names of God that express His being and character, it was the fullest and the truest—this was to be learnt as men were guided into all the truth. Like all such names, it had its inner and its outer circles of application. It was true of all men, true of all members of the Church of Christ, true of those who were led by the Spirit, in different degrees; but all true theology rests on the assumption that the ever-widening circles have the same centre, and that that centre is the Love of the Father.” (Ellicott)