Wątki egidiańskie i tomistyczne w koncepcji esse Jana Wersora

The aim of this article is to show that John Versor’s concept of esse presented in his commentary on De ente et essentia by Thomas Aquinas is not in accordance with the Thomistic view. Versor distinguishes two kinds of esse: esse essentiae and esse existentiae. The former pertains to non-substantial beings, and the latter pertains only to the substances. Additionally, esse existentiae is regarded as the proper act of substance. This theory of “double esse” is not to be found in Aquinas’ works; yet, it has been worked out by Giles of Rome, who seems to be the source of inspiration for Versor. Moreover, the further influences of Giles of Rome upon Versor’s philosophy can be found in his consideration of real difference between essence and existence. Therefore, in respect of the concept of esse, due to influences of Giles of Rome, John Versor cannot be regarded as the follower of Thomas Aquinas in the strict sense.