since man is the name of a thing, and species is a name of an intention.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic species intention
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/17611/pg17611-images.html

Context

“Therefore this definition is incorrect. Obj. 3: Further, an intentional term must not be included in the definition of a thing. For to define a man as "a species of animal" would not be a correct definition; since man is the name of a thing, and species is a name of an intention. Therefore, since person is the name of a thing (for it signifies a substance of a rational nature) , the word "individual" which is an intentional name comes improperly into the definition. Obj. 4: Further, "Nature is the principle of motion and rest, in those things in which it is essentially, and not accidentally,"” source