Of Prayer, by John Calvin, tr. Henry Beveridge , at sacred-texts.com
The first thing suggested at the very outset is, as we have already said (sec. 17-19), that all our prayers to God ought only to be presented in the name of Christ, as there is no other name which can recommend them. In calling God our Father, we certainly plead the name of Christ. For with what confidence could any man call God his Father? Who would have the presumption to arrogate to himself the honour of a son of God were we not gratuitously adopted as his sons in Christ? He being the true Son, has been given to us as a brother, so that that which he possesses as his own by nature becomes ours by adoption, if we embrace this great mercy with firm faith. As John says, "As many as received him, to them gave he power to become the sons of God, even to them that believe in his name" (John 1:12). Hence he both calls himself our Father, and is pleased to be so called by us, by this delightful name relieving us of all distrust, since nowhere can a stronger affection be found than in a father. Hence, too, he could not have given us a stronger testimony of his boundless love than in calling us his sons. But his love towards us is so much the greater and more excellent than that of earthly parents, the farther he surpasses all men in goodness and mercy (Isaiah 63:16). Earthly parents, laying aside all paternal affection, might abandon their offspring; he will never abandon us (Psalm 27:10), seeing he cannot deny himself. For we have his promise, "If ye then, being evil, know how to give good gifts unto your children, how much more shall your Father which is in heaven give good things to them that ask him?" (Matthew 7:11). In like manner in the prophet, "Can a woman forget her sucking child, that she should not have compassion on the son of her womb? Yea, they may forget, yet will not I forget thee" (Isaiah 49:15). But if we are his sons, then as a son cannot betake himself to the protection of a stranger and a foreigner without at the same time complaining of his father's cruelty or poverty, so we cannot ask assistance from any other quarter than from him, unless we would upbraid him with poverty, or want of means, or cruelty and excessive austerity.