Marxian Socialism must always remain a portent to the historians of Opinion—how a doctrine so illogical and so dull can have exercised so powerful an… - John Maynard Keynes

The difficulty lies not so much in developing new ideas as in escaping from old ones.

Thus, after all, the actual rates of aggregate saving and spending do not depend on Precaution, Foresight, Calculation, Improvement, Independence, Enterprise, Pride or Avarice. Virtue and vice play no part. It all depends on how far the rate of interest is favourable to investment, after taking account of the marginal efficiency of capital. No, this is an overstatement. If the rate of interest were so governed as to maintain continuous full employment, virtue would resume her sway; — the rate of capital accumulation would depend on the weakness of the propensity to consume. Thus, once again, the tribute that classical economists pay to her is due to their concealed assumption that the rate of interest always is so governed.

Newton was not the first of the age of reason. He was the last of the magicians, the last of the Babylonians and Sumerians, the last great mind that looked out on the visible and intellectual world with the same eyes as those who began to build our intellectual inheritance rather less than 10,000 years ago.