I know "without conversion" and "without confusion" come from the Athenasian Creed:WCF Chapter 8; II. The Son of God, the second person of the Trinity, being very and eternal God, of one substance and equal with the Father, did, when the fullness of time was come, take upon Him man's nature,[10] with all the essential properties, and common infirmities thereof, yet without sin;[11] being conceived by the power of the Holy Ghost, in the womb of the virgin Mary, of her substance.[12] So that two whole, perfect, and distinct natures, the Godhead and the manhood, were inseparably joined together in one person, without conversion, composition, or confusion.[13] Which person is very God, and very man, yet one Christ, the only Mediator between God and man.[14]
Who, although He is God and man, yet He is not two, but one Christ.
One, not by conversion of the Godhead into flesh, but by taking of the manhood into God.
One altogether, not by the confusion of substance, but by unity of person.
Where does "without composition" come from?