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We must be content then, in speaking of such things and from such

data, to set forth the truth roughly and in outline; in other

words, since we are speaking of general matter and from general

data, to draw also conclusions merely general. And in the same

spirit should each person receive what we say: for the man of

education will seek exactness so far in each subject as the

nature of the thing admits, it being plainly much the same

absurdity to put up with a mathematician who tries to persuade

instead of proving, and to demand strict demonstrative reasoning

of a Rhetorician.

Now each man judges well what he knows, and of these things he is

a good judge: on each particular matter then he is a good judge

who has been instructed in it, and in a general way the man of

general mental cultivation.[2]