"The finest virtues can become deformed with age. The precise mind becomes finicky; the thrifty man, miserly; the cautious man, timorous; the man of imagination, fanciful. Even perseverance ends up in a sort of stupidity. Just as, on the other hand, being too willing to understand too many opinions, too diverse ways of seeing, constancy is lost and the mind goes astray in a restless fickleness."