But there is no need to expand this further. The principle is plain that, though these better and higher graces of humanity are impediments and encumbrances in the early fighting period, yet that in the later era they are among the greatest helps and benefits, and that as soon as governments by discussion have become strong enough to secure a stable existence, and as soon as they have broken the fixed rule of old custom, and have awakened the dormant inventiveness of men, then, for the first time, almost every part of human nature begins to spring forward, and begins to contribute its quota even to the narrowest, even to 'verifiable' progress. And this is the true reason of all those panegyrics on liberty which are often so measured in expression but are in essence so true to life and nature. Liberty is the strengthening and developing power--the light and heat of political nature; and when some 'Caesarism' exhibits as it sometimes will an originality of mind, it is only because it has managed to make its own the products of past free times or neighbouring free countries; and even that originality is only brief and frail, and after a little while, when tested by a generation or two, in time of need it falls away. In a complete investigation of all the conditions of 'verifiable progress,' much else would have to be set out; for example, science has secrets of her own. Nature does not wear her most useful lessons on her sleeve; she only yields her most productive secrets, those which yield the most wealth and the most 'fruit,' to those who have gone through a long process of preliminary abstraction. To make a person really understand the 'laws of motion' is not easy, and to solve even simple problems in abstract dynamics is to most people exceedingly hard. And yet it is on these out-of-the-way investigations, so to speak, that the art of navigation, all physical astronomy, and all the theory of physical movements at least depend. But no nation would beforehand have thought that in so curious a manner such great secrets were to be discovered. And many nations, therefore, which get on the wrong track, may be distanced--supposing there to be no communication by some nation not better than any of them which happens to stumble on the right track. If there were no 'Bradshaw' and no one knew the time at which trains started, a man who caught the express would not be a wiser or a more business-like man than he who missed it, and yet he would arrive whole hours sooner at the capital both are going to. And unless I misread the matter, such was often the case with early knowledge. At any rate before a complete theory of 'verifiable progress' could be made, it would have to be settled whether this is so or not, and the conditions of the development of physical science would have to be fully stated; obviously you cannot explain the development of human comfort unless you know the way in which men learn and discover comfortable things.