Someday, I want to write a book about the importance of ideas called "The Possibility of Civilization," based on this quote from John Maynard Keynes:

"To the economists--who are the trustees, not of civilization, but of the possibility of civilization."

A couple of days ago, Howard Baetjer and I were talking about the closing passages in Ludwig von Mises's Socialism and Human Action. Both can be downloaded from Mises.org. Here's the end of Socialism, and here's the penultimate paragraph:

The great social discussion cannot proceed otherwise than by means of the thought, will, and action of individuals. Society lives and acts only in individuals; it is nothing more than a certain attitude on their part. Everyone carries a part of society on his shoulders; no one is relieved of his share of responsibility by others. And no one can find a safe way out for himself if society is sweeping towards destruction. Therefore everyone, in his own interests, must thrust himself vigorously into the intellectual battle. None can stand aside with unconcern; the interests of everyone hang on the result. Whether he chooses or not, every man is drawn into the great historical struggle, the decisive battle into which our epoch has plunged us.

And here's the end of Human Action:

Man's freedom to choose and to act is restricted in a threefold way. There are first the physical laws to whose unfeeling absoluteness man must adjust his conduct if he wants to live. There are second the individual's innate constitutional characteristics and dispositions and the operation of environmental factors; we know that they influence both the choice of the ends and that of the means, although our cognizance of the mode of their operation is rather vague. There is finally the regularity of phenomena with regard to the interconnectedness of means and ends, viz., the praxeological law as distinct from the physical and from the physiological law.

The elucidation and the categorial and formal examination of this third class of laws of the universe is the subject matter of praxeology and its hitherto best-developed branch, economics. The body of economic knowledge is an essential element in the structure of human civilization; it is the foundation upon which modern industrialism and all the moral, intellectual, technological, and therapeutical achievements of the last centuries have been built. It rests with men whether they will make the proper use of the rich treasure with which this knowledge provides them or whether they will leave it unused. But if they fail to take the best advantage of it and disregard its teachings and warnings, they will not annul economics; they will stamp out society and the human race.