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Aristotle, the ancient Greek philosopher, was born in 384 BC. He studied at Plato's Academy for many years, acted as tutor to the Macedonian prince later known as Alexander the Great, and in 335 opened his own school in Athens called the Lyceum. Book One of the Nicomachean Ethics contains his remarks on the certainty to be found in different subjects.

Our discussion will be adequate if it achieves clarity within the limits of the subject matter. For precision cannot be expected in the treatment of all subjects alike, any more than it can be expected in all manufactured articles. Problems of what is noble and just, which politics examines, present so much variety and irregularity that some people believe that they exist only by convention and not by nature. The problem of the good, too, presents a similar kind of irregularity, because in many cases good things bring harmful results. There are instances of men ruined by wealth, and others by courage. Therefore, in a discussion of such subjects, which has to start from a basis of this kind, we must be satisfied to indicate the truth with a rough and general sketch: when the subject and the basis of a discussion consist of matters that hold good only as a general rule, but not always, the conclusions reached must be of the same order. The various points that are made must be received in the same spirit. For a well-schooled man is one who searches for that degree of precision in each kind of study which the nature of the subject at hand admits: it is obviously just as foolish to accept arguments of probability from a mathematician as to demand strict demonstrations from an orator. (Nicomachean Ethics, translated by Marvin Ostwald)