Major proved; pagan confession
The major is proved in two ways. First, because an independent being or one existing from itself exists by the force of its essence or nature, and therefore existence belongs to it as necessarily as essence. Second, because an independent being neither could once not have been, nor hereafter not be. Therefore it is absolutely necessary.
FOURTH, also by the confession of Gentile philosophers. For Orpheus spoke of the necessity of all things — that is, a substance which is necessarily through itself, and on which all the rest depend, but itself on none. Aristotle calls God a necessary, perpetual being. Apuleius: I would judge necessity itself to be called nothing other than God. Avicenna: That holy thing is the necessary being which is from itself, but not the remaining beings, even if they have necessity of existing from another.
Latin
Major duobus modis probatur. Primo, quia ens independens vel exsistens a seipso, exsistit vi essentiae sive naturae suae, ac proinde illi exsistentia tam necessario competit, quam essentia. Secundo, quia ens independens, nec potuit aliquando non fuisse, nec posthac non esse. Ergo est absolute necessarium. QUARTO, Confessione etiam gentilium philosophorum. Orpheus enim dixit rerum omnium necessitatem, hoc est, substantiam, quae sit necessario per seipsam, & a qua caetera omnia dependeant, ipsa vero a nullo. Aristoteles: Deum dicit, ens necessarium, perpetuum. Apulejus: necessitatem ipsam nihil aliud, quam Deum, dici censuerim. Avicenna: Illud sanctum esse ens necessarium, quod ex se est, non vero entia reliqua, etiamsi ab alio habeant necessitatem exsistendi.