/summa/SS/SSIV/SS_Q176:
We must now consider those gratuitous graces that pertain to speech, and (1) the grace of tongues; (2) the grace of the word of wisdom and knowledge. Under the first head there are two points of inquiry:
(1) Whether by the grace of tongues a man acquires the knowledge of all languages?
(2) Of the comparison between this gift and the grace of prophecy.