Demonstrations by Syllogisms

Theodoret of Cyrus (393–458)

That God the Word is Immutable

1. We have confessed one substance of the Father, of the Son, and of the Holy Ghost, and have agreed that it is immutable. If then there is one substance of the Trinity, and it is immutable, then the only begotten Son, who is one person of the Trinity, is immutable. And, if He is immutable, He was not made flesh by mutation, but is said to have been made flesh after taking flesh.

2. If God the Word was made flesh by undergoing mutation into flesh, then He is not immutable. For no one in his senses would call that which undergoes alteration immutable. And if He is mutable He is not of one substance with Him that begat Him. How indeed is it possible for one part of an uncompounded substance to be mutable and the other immutable? If we grant this we shall fall headlong into the blasphemy of Arius and Eunomius, who assert that the Son is of another substance.

See also

• More works by Theodoret of Cyrus

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