But the living or animated being is a higher species than animal and man, because an animal is a sensible animated substance.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic species animal
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/19950/pg19950-images.html

Context

“otherwise what is said in Ps. 109:4 would not be true: "Thou art a priest for ever." Therefore Christ was a man during those three days. On the contrary, When the higher [species] is removed, so is the lower. But the living or animated being is a higher species than animal and man, because an animal is a sensible animated substance. Now during those three days of death Christ's body was not living or animated. Therefore He was not a man. I answer that, It is an article of faith that Christ was truly dead: hence it is an error against faith to assert anything whereby the truth of Christ's death is destroyed.” source