Thomas Aquinas

“ A thing is considered in itself before being compared with something else. Wherefore to wisdom belongs first of all contemplation which is the vision of the Beginning, and afterwards the direction of human acts according to the Divine rules. ”

“ But folly is in the intellect. Therefore wisdom is also.
I answer that, As stated above (A [1] ) , wisdom denotes a certain rectitude of judgment according to the Eternal Law. Now rectitude of judgment is twofold: first, on account of perfect use of reason, secondly, on account of a certain connaturality with the matter about which one has to judge. Thus, about matters of chastity, a man after inquiring with his reason forms a right judgment, if he has learnt the science of morals, while he who has the habit of chastity judges of such matters by a kind of connaturality. ”

“ I answer that, The seventh beatitude is fittingly ascribed to the gift of wisdom, both as to the merit and as to the reward. The merit is denoted in the words, "Blessed are the peacemakers." Now a peacemaker is one who makes peace, either in himself, or in others: and in both cases this is the result of setting in due order those things in which peace is established, for "peace is the tranquillity of order," according to Augustine (De Civ. Dei xix, 13) . ”

“ Objection 2: Further, the practical intellect is about matters of operation which are contingent. But wisdom is about Divine things which are eternal and necessary. Therefore wisdom cannot be practical. ”

“ Now whoever turns away from his due end, must needs fix on some undue end, since every agent acts for an end. Wherefore, if he fixes his end in external earthly things, his "wisdom" is called "earthly," if in the goods of the body, it is called "sensual wisdom," if in some excellence, it is called "devilish wisdom" because it imitates the devil's pride, of which it is written (Job 41:25) : "He is king over all the children of pride." ”

“ Accordingly he that knows the highest cause in any particular genus, and by its means is able to judge and set in order all the things that belong to that genus, is said to be wise in that genus, for instance in medicine or architecture, according to 1 Cor. 3:10: "As a wise architect, I have laid a foundation." On the other hand, he who knows the cause that is simply the highest, which is God, is said to be wise simply, because he is able to judge and set in order all things according to Divine rules. ”

“ Nor from the direction of wisdom does there result any bitterness or toil in human acts; on the contrary the result of wisdom is to make the bitter sweet, and labor a rest.
Art. 4 - Whether wisdom can be without grace, and with mortal sin? Objection 1: It would seem that wisdom can be without grace and with mortal sin. For saints glory chiefly in such things as are incompatible with mortal sin, according to 2 Cor. 1:12: "Our glory is this, the testimony of our conscience." Now one ought not to glory in one's wisdom, according to Jer. 9:23: "Let not the wise man glory in his wisdom." ”

“ Secondly, in those matters in which he is not sufficient by himself, he should be guided by the advice of others, and as to this we are told further that wisdom is "easy to be persuaded." These two are conditions required that man may be at peace with himself. But in order that man may be at peace with others it is furthermore required, first that he should not be opposed to their good ”