Volumes might be written upon the follies and imbecilities of great men. A full rounded man - a man of sterling sense and natural logic - is just as rare as a great painter, poet, or sculptor. If you tell your friend that he is not a painter, that he has no genius for poetry, he will probably admit the truth of what you say, without feeling that he has been insulted in the least. But if you tell him that he is not a logician, that he has but little idea of the value of a fact, that he has no real conception of what evidence is, and that he never had an original thought in his life, he will cut your acquaintance.