I was slow in discovering the above-mentioned connection of my doctrine of social evolution with the orthodox system of economy. The most clear-sighted minds of three centuries have been at work upon that system; and if a new doctrine is to win acceptance, it is absolutely necessary that its propounder should not merely refute the old doctrine and expose its errors, but should trace back and lay open to its remotest source the particular process of thought which led these heroes of our science into their errors. It is not enough to show _that_ and _wherefore_ their theses were false; it must also be made clear _how_ and _wherefore_ those thinkers arrived at their false theses, what it was that forced them--despite all their sagacity--to hold such theses as correct though they are simply absurd when viewed in the light of truth. I pondered in vain over this enigma, until suddenly, like a ray of sunlight, there shot into the darkness of my doubt the discovery that in its essence my work was nothing but the necessary outcome of what others had achieved--that my theory was in no way out of harmony with the numerous theories of my predecessors, but that rather, when thoroughly understood, it was the very truth after which all the other economists had been searching, and upon the track of which--and this I held to be decisive--I had been thrown, not by my own sagacity, but solely by the mental labours of my great predecessors. In other words, _the solution of the social problem offered by me is the very solution of the economic problem which the science of political economy has been incessantly seeking from its first rise down to the present day_. But, I hear it asked, does political economy possess such a problem--one whose solution it has merely attempted but not arrived at? For it is remarkable that in our science the widest diversity of opinions co-exists with the most dogmatic orthodoxy. Very few draw from the existence of the numberless antagonistic opinions the self-evident conclusion that those opinions are erroneous, or at least unproved; and none are willing to admit that--like their opponents--they are merely seeking the truth, and are not in possession of it. So prevalent is this tenacity of opinion which puts faith in the place of knowledge that the fact that every science owes its origin to a problem is altogether forgotten. This problem may afterwards find its solution, and therewith the science will have achieved its purpose; but without a problem there is no investigation--consequently, though there may be knowledge, there will be no science. Clear and simple cognisances do not stimulate the human mind to that painstaking, comprehensive effort which is the necessary antecedent of science; in brief, a science can arise only when things are under consideration which are not intelligible directly and without profound reflection--things, therefore, which contain a problem.