If any one affirms that the flesh of Christ is consubstantial with the divinity, and refuses to acknowledge that He, subsisting Himself in the form of God as God before all ages, emptied Himself and took the form of a servant, even as it is written, let him be anathema.
Explication.
How could the flesh, which is conditioned by time, be said to be consubstantial with the timeless divinity? For that is designated consubstantial which is the same in nature and in eternal duration without variableness.
Reproduced in full. Translation: Ante-Nicene Fathers, vol. 6 (Roberts and Donaldson, 1886), public domain (Public domain).