Necessity, in a general way, denotes a strict connection between different beings, or the different elements of a being, or between a being and its existence. It is therefore a primary and fundamental notion, and it is important to determine its various meanings and applications in philosophy and theology.
In Logic, the Schoolmen, studying the mutual relations of concepts which form the matter of our judgments, divided the judgments or propositions into judgments in necessary matter ( in materia necessaria ), and judgments in contingent matter ( in materia contingenti ). (Cf. S. Thom., I Perihermen, lect. xiii.) The judgments in necessary matter were known as propositiones per se ; they are called by modern philosophers "analytic", "rational", "pure", or "a priori" judgments. The propositio per se is defined by the Schoolmen as one the predicate of which is either a constitutive element or a natural property of the subject. Such is the case with primary truths, metaphysical, and mathematical principles. (Cf. S. Thom., "in I Anal.", lect. x and xxxv; "de Anima", II, lect. xiv.) It is by ignoring the last part of this definition and arbitrarily restricting the concept of analytic judgments to those of which the predicate is a constitutive element of the subject, that Kant invented the false notion of synthetic- a priori judgments.
Considered under its metaphysical aspect, being in its relation to existence is dividend into necessary and contingent. A necessary being is one of which the existence is included in and identical with its very essence. The different beings which we observe in our daily experience are subject to beginning, to change, to perfection, and to destruction; existence is not essential to them and they have not in themselves the reason of their existence ; they are contingent. Their existence comes to them from an external efficient cause. It is from the real existence of contingent beings that we arrive at the notion and prove the existence of a necessary being-one that produces them but is not produced, one whose existence is its own essence and nature, that is at the same time eternal, all-perfect, infinite, viz., God (see CONTINGENCY). And so in relation to existence, God alone is absolutely necessary, all others are contingent.
When we consider the divers beings, not from the point of view of existence, but in relation to their constitution and activity, necessity may be classified as metaphysical, physical , and moral.
Again, in relation to the means necessary to salvation theologians divide necessity into necessity of means and necessity of precept. In the first case the means is so necessary to salvation that without it (absolute necessity) or its substitute (relative necessity), even if the omission is guiltless, the end cannot be reached. Thus faith and baptism of water are necessary by a necessity of means, the former absolutely, the latter relatively, for salvation. In the second case, necessity is based on a positive precept, commanding something the omission of which, unless culpable, does not absolutely prevent the reaching of the end.
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