as soon as they prove to you, for instance, that you are descended from a monkey, then it is no use scowling, accept it for a fact- when they prove to you that in reality one drop of your own fat must be dearer to you than a hundred thousand of your fellow-creatures, and that this conclusion is the final solution of all so-called virtues and duties and all such prejudices and fancies, then you have just to accept it, there is no help for it, for twice two is a law of mathematics. just try refuting it.