They are fickle in their desires, which are violent while they last, but quickly over. … They have exalted notions, because they have not yet been humbled by life or learnt its necessary limitations; moreover, their hopeful disposition makes them think themselves equal to great things-and that means exalted notions. … All their mistakes are in the direction of doing things excessively and vehemently. … They love too much and hate too much, and the same with everything else. They think they know everything; and are always quite sure about it; this in fact, is why they overdo everything.