Whoever learns from man does not receive knowledge immediately from the intelligible species which are in his mind, but through sensible words, which are signs of intelligible concepts.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic learning species
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

“"Our Lord asked questions not in order to learn anything, but in order to teach by questioning. For from the same well of knowledge came the question and the wise reply." Hence the Gospel goes on to say that "all that heard Him were astonished at His wisdom and His answers." Reply Obj. 2: Whoever learns from man does not receive knowledge immediately from the intelligible species which are in his mind, but through sensible words, which are signs of intelligible concepts. Now as words formed by a man are signs of his intellectual knowledge; so are creatures, formed by God, signs of His wisdom. Hence it is written (Ecclus. 1:10) that God "poured" wisdom "out upon all His works."” source