El origen de la idea de la nada en Tomás de Aquino

The origin of the idea of non-being is a fundamental issue in metaphysics. Its absense would indicate an inability to understand the principle of non-contradiction. This article will study relevant texts in Thomas Aquinas’s corpus, and will propose an interpre-tation about the origin of the idea of non-being. The assertion ego affirmo aliquid esse (“I affirm that something exists”) not only affirms the existence of aliquid, but also, in a secondary way, the existence of my assertion, and the existence of my self. The dou-ble object of this assertion (“something exists” and “I am”) consti-tutes the first intellectual difference, which is precisely the origin of the idea of non-being.