REASON II from operations of will; REASON III from the soul's ultimate rest
II. From the operations of the will. That which by its will is so carried toward every good as the intellect toward every true thing, delights in the beauty of all things, and in admiring the artifice that shines in singulars, and also in just and honest actions and liberal disciplines; is free, and can itself specify its actions and determine to either part of opposites; often also resists its own body, rules its affections, and operates contrary to what they urge: that is immortal. But the rational soul by its will produces such operations. Therefore it is immortal.
III. From its ultimate rest. Whatever nothing non-eternal fills, and for which neither time nor place nor life nor pleasure nor honor nor empire nor finally any good, however great, when apprehended as mortal and something about to fail, neither all these together nor each singly so satisfy that it rests in them: that is eternal and immortal. But the rational soul is such. Therefore it is immortal and eternal.
Latin
II. Ab operationibus voluntatis. Quae voluntate sua in omne bonum sic fertur, ut intellectus in omne verum, delectatur rerum omnium pulchritudine, & admirando, quod in singulis resplendet, artificio, actionibus etiam justis & honestis ac liberalibus disciplinis: libera est, & ipsa suas actiones specificare, atque ad alterutram partem oppositorum determinare potest, repugnat etiam saepenumero corpori suo, dominatur affectibus ejus, & contra, quam illi instigant, operatur: ea est immortalis. Atqui anima rationalis voluntate sua tales operationes edit. Ergo est immortalis. III. A quiete illius ultima. Quicquid nihil non aeternum implet, & cui nec tempus, nec locus, nec vita, nec voluptas, nec honor, nec imperium, nec ullum denique bonum, quantumvis maximum, quando tanquam mortale & aliquid defuturum apprehenditur, neque haec cuncta, neque singula sic satisfaciunt, ut in eis acquiescat: id est aeternum & immortale. Atqui anima rationalis est talis. Ergo est immortalis & aeterna.