I doubt if these two fine, active minds [President and Mrs. Roosevelt] have ever inquiried how it is they know what they know and think as they do. Nor have they ever thought of what they might have been if they had grown up in an entirely different culture. They have the disposition of all politicians world over to deal only with made opinion. They have never inquired how it is that opinion is made.
If a man of good natural disposition acquires Intelligence [as a whole], then he excels in conduct, and the disposition which previously only resembled Virtue, will now be Virtue in the true sense. Hence just as with the faculty of forming opinions [the calculative faculty] there are two qualities, Cleverness and Prudence, so also in the moral part of the soul there are two qualities, natural virtue and true Virtue; and true Virtue cannot exist without Prudence.
If a man will stand up and assert, and repeat and re-assert, that two and two do not make four, I know nothing in the power of argument that can stop him.