Deinde id quod ex necessitate naturæ alicujus attributi ita sequitur, non potest determinatam habere existentiam sive durationem. Nam si neges, supponatur res quæ ex necessitate naturæ alicujus attributi sequitur, dari in aliquo Dei attributo exempli gratia idea Dei in cogitatione eaque supponatur aliquando non exstitisse vel non exstitura. Cum autem cogitatio Dei attributum supponatur, debet et necessario et immutabilis existere (per propositionem 11 et corollarium II propositionis 20). Quare ultra limites durationis ideæ Dei (supponitur enim aliquando non exstitisse aut non exstitura) cogitatio sine idea Dei existere debebit; atqui hoc est contra hypothesin; supponitur enim ex data cogitatione necessario sequi ideam Dei. Ergo idea Dei in cogitatione aut aliquid quod necessario ex absoluta natura alicujus attributi Dei sequitur, non potest determinatam habere durationem sed per idem attributum æternum est, quod erat secundum. Nota hoc idem esse affirmandum de quacunque re quæ in aliquo Dei attributo ex Dei absoluta natura necessario sequitur.
We have now granted, therefore, thought not constituting the idea of God, and, accordingly, the idea of God does not naturally follow from its nature in so far as it is absolute thought (for it is conceived as constituting, and also as not constituting, the idea of God), which is against our hypothesis. Wherefore, if the idea of God expressed in the attribute thought, or, indeed, anything else in any attribute of God (for we may take any example, as the proof is of universal application) follows from the necessity of the absolute nature of the said attribute, the said thing must necessarily be infinite, which was our first point.
Furthermore, a thing which thus follows from the necessity of the nature of any attribute cannot have a limited duration. For if it can, suppose a thing, which follows from the necessity of the nature of some attribute, to exist in some attribute of God, for instance, the idea of God expressed in the attribute thought, and let it be supposed at some time not to have existed, or to be about not to exist.
Now thought being an attribute of God, must necessarily exist unchanged (by Prop. xi., and Prop. xx., Coroll. ii.); and beyond the limits of the duration of the idea of God (supposing the latter at some time not to have existed, or not to be going to exist) thought would perforce have existed without the idea of God, which is contrary to our hypothesis, for we supposed that, thought being given, the idea of God necessarily flowed therefrom. Therefore the idea of God expressed in thought, or anything which necessarily follows from the absolute nature of some attribute of God, cannot have a limited duration, but through the said attribute is eternal, which is our second point. Bear in mind that the same proposition may be affirmed of anything, which in any attribute necessarily follows from God's absolute nature.