4 For the name of the Father, with the very utterance of the title, suggests the thought of the Son: as in like manner one who names the Son thinks straightway of the Father also. For if a Father, He is certainly the Father of a Son; and if a Son, certainly the Son of a Father. Lest therefore from our speaking thus, In One God, the Father Almighty, Maker of Heaven and Earth, and of All Things Visible and Invisible, and from our then adding this also, And in One Lord Jesus Christ, any one should irreverently suppose that the Only-begotten is second in rank to heaven and earth—for this reason before naming them we named God the Father, that in thinking of the Father we might at the same time think also of the Son: for between the Son and the Father no being whatever comes.
Source: Catechetical Lectures (New Advent)