The masters of Arts were immersed in an incredibly rich intellectual environment from which they took many tools but to which they also contributed. Although they cultivated the literal genre of commentary it does not mean that they only repeated the theories of others. Usually, those commentaries are original constructions that almost use the commented work as an excuse to expose a personal doctrine. The case of the masters of Arts is eloquent. The commentaries on the Ethica Noua (the Latin translation of book I of Nicomachean Ethics) include contents that largely exceed those of the first book of Nicomachean Ethics.