9 Believe then that this Only-begotten Son of God for our sins came down from heaven upon earth, and took upon Him this human nature of like passions with us, and was begotten of the Holy Virgin and of the Holy Ghost, and was made Man, not in seeming and mere show, but in truth; nor yet by passing through the Virgin as through a channel; but was of her made truly flesh, [and truly nourished with milk], and did truly eat as we do, and truly drink as we do. For if the Incarnation was a phantom, salvation is a phantom also. The Christ was of two natures, Man in what was seen, but God in what was not seen; as Man truly eating like us, for He had the like feeling of the flesh with us; but as God feeding the five thousand from five loaves; as Man truly dying, but as God raising him that had been dead four days; truly sleeping in the ship as Man, and walking upon the waters as God.
Of the Cross.
Source: Catechetical Lectures (New Advent)