Thomas Aquinas 
Aquinas Ethicus [EPUB ebook] 

The Sovereign Pontiff, Leo XIII., in his Encyclical on Scholastic Philosophy, writes as follows: “Let the teachers whom you shall discreetly choose make it their aim to instil the doctrine of Thomas Aquinas into the minds of their scholars, and to set in a clear light his solidity and excellence above other authors. . . . But lest supposititious utterances be taken for true, or adulterate for genuine, see to it that the wisdom of Thomas be drunk in from his own streams.”