Truth

Truth is a relation which holds (1) between the knower and the known -- Logical Truth; (2) between the knower and the outward expression which he gives to his knowledge -- Moral Truth; and (3) between the thing itself, as it exists, and the idea of it, as conceived by God -- Ontological Truth. In each case this relation is, according to the Scholastic theory, one of correspondence, conformity, or agreement(adoequatio) (St. Thomas, Summa I:21:2)