That the bible says Jesus is the only begotten Son of God is rationality for believing or assuming that God is the true Father of Christ in the natural sense.
The
spiritual sense.
The anthropomorphism of biblical language
'The presentation of man as "the image and likeness of God" at the very beginning of Sacred Scripture has
another significance too. It is the key for understanding biblical Revelation as God's word about himself. Speaking about himself, whether through the prophets, or through the Son" (cf.
Heb 1:1, 2) who became man,
God speaks in human language, using human concepts and images. If this manner of expressing himself is characterized by a certain anthropomorphism, the reason is that man is "like" God: created in his image and likeness. But then,
God too is in some measure "like man", and precisely because of this likeness, he can be humanly known. At the same time, the language of the Bible is sufficiently precise to indicate the limits of the "likeness", the limits of the "analogy". For biblical Revelation says that, while man's "likeness" to God is true, the "
non-likeness" which separates the whole of creation from the Creator is
still more essentially true. Although man is created in God's likeness, God does not cease to be for him the one "who dwells in unapproachable light" (1
Tim 6:16): he is the "Different One", by essence the "totally Other".
This observation on the limits of the analogy - the limits of man's likeness to God in biblical language - must also be kept in mind when, in different passages of Sacred Scripture (especially in the Old Testament), we find
comparisons that attribute to God "masculine" or "feminine" qualities. We find in these passages an indirect confirmation of the truth that both man and woman were created in the image and likeness of God. If there is a likeness between Creator and creatures, it is understandable that the Bible would refer to God using expressions that attribute to him both "masculine" and "feminine" qualities.
We may quote here some characteristic passages from the prophet
Isaiah: "But Zion said, 'The Lord has forsaken me, my Lord has forgotten me'.
'Can a woman forget her sucking child, that she should have no compassion on the son of her womb? Even these may forget, yet I will
not forget you'". (49:14-15). And elsewhere: "As one whom his
mother comforts, so will I comfort you; you shall be comforted in Jerusalem" (66: 13). In the Psalms too God is compared to a caring mother: "Like a child quieted at its mother's breast; like a child that is quieted is my soul. O Israel, hope in the Lord".
(Ps 131:2-3). In various passages the love of God who cares for his people is shown to be like that of a mother: thus,
like a mother God "has carried" humanity, and in particular, his Chosen People, within his own womb; he has given birth to it in travail, has nourished and comforted it (cf.
Is 42:14; 46: 3-4). In many passages God's love is presented as the "masculine" love of the bridegroom and father (cf.
Hosea 11:1-4;
Jer 3:4-19), but also sometimes as the "feminine" love of a mother.
This characteristic of biblical language - its anthropomorphic way of speaking about God -
points indirectly
to the mystery of the eternal "generating" which belongs to the inner life of God. Nevertheless, in itself this "generating" has neither "masculine" nor "feminine" qualities. It is by nature totally divine. It is spiritual in the most perfect way, since "God is spirit" (
Jn 4:24) and possesses no property typical of the body, neither "feminine" nor "masculine". Thus even "
fatherhood" in God is completely divine and free of the "masculine" bodily characteristics proper to human fatherhood. In this sense the Old Testament spoke of God as a Father and turned to him as a Father. Jesus Christ - who called God "Abba Father"
(Mk 14: 36), and who as the only-begotten and consubstantial Son placed this truth at the very centre of his Gospel, thus establishing the norm of Christian prayer - referred to fatherhood in this ultra-corporeal, superhuman and completely divine sense. He spoke as the Son, joined to the Father by the eternal mystery of divine generation, and he did so while being at the same time the truly human Son of his Virgin Mother.
Although it is not possible to attribute human qualities to the eternal generation of the Word of God, and although the divine fatherhood does not possess "masculine" characteristics in a physical sense, we must nevertheless seek in God the absolute
model of all "
generation" among human beings. This would seem to be the sense of the Letter to the Ephesians: "I bow my knees before the Father, from whom every family in heaven and on earth is named" (3:14-15). All "generating" among creatures finds its primary model in that generating which in God is completely divine, that is, spiritual. All "generating" in the created world is to be likened to this absolute and uncreated model. Thus every element of human generation which is proper to man, and every element which is proper to woman, namely human "
fatherhood" and "
motherhood", bears within itself a likeness to, or analogy with the divine "generating" and with that "fatherhood" which in God is "totally different", that is, completely spiritual and divine in essence; whereas in the human order, generation is proper to the "unity of the two": both are "parents", the man and the woman alike.