I always wonder at the often repeated words, “Yes, it is all true in theory, but how is it in practice?” As though the theory were only a collection of words useful for conversation, and not as though all practice,—that is, all activity of life—were inevitably based upon it. There must have been an immense number of foolish theories in the world for men to employ such wonderful reasoning. We know that theory is what a man thinks about a thing, and practice is what he does. How can a man think that he ought to act in one way, and then do quite the reverse? If the theory of baking bread consists in this, that first of all one must knead the dough, then put it by to rise, anyone knowing it would be a fool to do the reverse. But with us it has come into fashion to say, “It is all very well in theory, but how would it be in practice?” In all that has occupied me practice has unavoidably followed theory, not mainly in order...