"... I believe the Father came down from heaven, as the apostles said he did, and begat the Saviour of the world; for he is the ONLY-begotten of the Father, which could not be if the Father did not actually beget him in person.... I believe the Father came down in His tabernacle and begat Jesus Christ."

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Just as in a physical body the operation of one member contributes to the good of the whole body, so it is in a spiritual body such as the Church. And since all the faithful are one body, the good of one member is communicated to another; everyone members, as the Apostle says, of one another [Eph 4:25]. For that reason, among the points of faith handed down by the Apostles, is that there is a community of goods in the Church, and this is expressed in the words Communion of Saints.

— Thomas Aquinas