Life in this lower world is bestowed on a corruptible nature, that needs generation to preserve the species, and nourishment to preserve the individual.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic life species
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

“not in the sense in which movement is an act of the imperfect. Reply Obj. 2: As God is His own very existence and understanding, so is He His own life; and therefore He so lives that He has no principle of life. Reply Obj. 3: Life in this lower world is bestowed on a corruptible nature, that needs generation to preserve the species, and nourishment to preserve the individual. For this reason life is not found here below apart from a vegetative soul: but this does not hold good with incorruptible natures. _______________________ FOURTH ARTICLE [I, Q. 18, Art. 4] Whether All Things Are Life in God?” source