Intermezzo zur Begriffsgeschichte (IH)

Thomas v. Aquin: Summa Theologica q 15 a 1

Idea enim graece, latine forma dicitur: unde per ideas intelliguntur formae aliarum rerum, praeter ipsas res existentes. Forma autem alicuius rei praeter ipsam existens, ad duo esse potest; vel ut sit exemplar eius cuius dicitur forma; vel ut sit principium cognitionis ipsius, secundum quod formae cognoscibilium dicuntur esse in cognoscente. Et quantum ad utrumque est necesse ponere ideas.

Quod sic patet. In omnibus enim quae non a casu generantur, necesse est formam esse finem generationis cuiuscumque. Agens autem non ageret propter formam, nisi inquantum similitudo formae est in ipso. Quod quidem contingit dupliciter. In quibusdam enim agentibus praeexistit forma rei fiendae secundum esse naturale, sicut in his quae agunt per naturam; sicut homo generat hominem, et ignis ignem. In quibusdam vero secundum esse intelligibile, ut in his quae agunt per intellectum; sicut similitudo domus praeexistit in mente aedificatoris. Et haec potest dici idea domus: quia artifex intendit domum assimilare formae quam mente concepit.

Quia igitur mundus non est casu factus, sed est factus a Deo per intellectum agente, ut infra patebit, necesse est quod in mente divina sit forma, ad similitudinem cuius mundus est factus. Et in hoc consistit ratio ideae.

For the Greek word Idea is in Latin "forma." Hence by ideas are understood the forms of things, existing apart from the things themselves. Now the form of anything existing apart from the thing itself can be for one of two ends: either to be the type of that of which it is called the form, or to be the principle of the knowledge of that thing, inasmuch as the forms of things knowable are said to be in him who knows them. In either case we must suppose ideas, as is clear for the following reason:

In all things not generated by chance, the form must be the end of any generation whatsoever. But an agent does not act on account of the form, except in so far as the likeness of the form is in the agent, as may happen in two ways. For in some agents the form of the thing to be made pre-exists according to its natural being, as in those that act by their nature; as a man generates a man, or fire generates fire. Whereas in other agents (the form of the thing to be made pre-exists) according to intelligible being, as in those that act by the intellect; and thus the likeness of a house pre-exists in the mind of the builder. And this may be called the idea of the house, since the builder intends to build his house like to the form conceived in his mind. As then the world was not made by chance, but by God acting by His intellect, as will appear later (46, 1), there must exist in the divine mind a form to the likeness of which the world was made. And in this the notion of an idea consists. Article 1. Whether there are ideas?

---