| | Finally, it is worth noting that there seems to be a common origin for many of the difficulties that face St. Thomas in working out his theory. It is the conviction, shown most clearly in his theory of knowledge, that no knowledge is of any value unless it is certainly true and known to be so. But if there is one lesson to be learned from the history of philosophy, it is that if we regard knowledge as tentative, experimental, and corrigible, we shall gradually acquire some information about what the universe is like and about our place in it. But if we regard it as intuitive, certain and incorrigible, we shall not learn any facts about anything because we have set our standards too high.
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Aquinas influenced the evolution of the idea of natural law in part because he was a practical as well as a speculative thinker. As the person who coined the term scientia politica , ''political science,'' he granted validity to the state and to human laws, thus paving the way for a place for the individual apart from superior authority. This was an important first step, although only a step, toward the transformation of individuals into full-fledged citizens. 25
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Aquinas was able to combine philosophy, theology, and politics because of his knowledge of Roman law. He was acutely aware, for example, of the difficulties posed by the notion of the ius gentium . Ulpian says that natural law, the ius naturale , is common to both man and animals, while the ius gentium applies only to human beings although it is the same everywhere. One ambiguity here is that "natural reason" is not common to animals and so can hardly be considered a basis for the ius gentium . Aquinas saw the ius gentium as so important that he dealt with this problem in two different treatises.
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Aquinas's great achievement was to provide a rational basis for both ethics and politics, the very institutions that earlier Christians considered hopelessly mired in sin and subject only to the remedy of grace. His momentous discovery was that natural law provided a medium by which to incorporate Aristotelian/Stoic ethics and politics into a Christian view of life. Once again human beings could be conceived of as political animals, and life in
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