Let us follow its trail for a while and see where we wind up. Happiness, which is the same thing as the common good, has a concrete meaning. If the political community—if, for example, the state—is to secure and preserve happiness, then it is necessary to understand happiness. The first principle in practical matters is the last end (ST IaIIae q.90 a.2 co.). It may be suggested that happiness consists, for example, in a particular arrangement of political and economic conditions that allow for citizens to do or not do this or that thing. Indeed, even in Catholic discourse, one might hear temporal happiness described in such terms, with the suggestion that eternal happiness is added to that in some way.
Yet this is a serious error. For one thing, when one makes political prudence or science the highest wisdom, one necessarily supposes that man is the best thing in the universe, as Aristotle tells us (NE 6.7, 1141a20). Man is however not the most excellent thing in the world (In VI Ethic. L.6, no. 1186). Another consequence, if one holds that man is the most excellent thing in the universe—and, therefore, that political science is the most excellent—would be to make actually practical rule impossible. Charles de Koninck, in his Principle of the New Order, demonstrates that practical reason directs to an end in accordance with right reason. This requires one to know the end. To reject the primacy of the speculative is to knock the legs out from underneath this process: without speculative reason one cannot know the final end—which is the first principle. Practical rule dissolves into mere will and chance.
The speculative intellect is important not merely for making practical rule possible. In the classical account, it is the proper end of law and the essence common good. Aristotle tells us that the most excellent virtue—complete happiness—is contemplative (NE 10.7, 1177a12). That is to say, for Aristotle, to contemplate what is true is the best part of man. And the contemplative life is the perfectly happy life. Aquinas explains that the contemplation of truth consists both in discovering the truth and in reflecting on truth already discovered (In X Ethic. L.10, no. 2092). However, reflecting on truth already discovered is more perfect than the investigations leading to the discovery of truth. The perfectly happy life, therefore, comes from contemplation by reason perfected by the intellectual virtue of truth.
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