I could never take seriously the standard view that historians should take ideas as give, and confine themselves to their effects; or even worse, the… - Robert Skidelsky

Keynes's idea was very simple. Monetary and fiscal policy should have a single goal, jointly pursued, of maintaining a full employment level aggregate demand.

Keynes had a political objective. Unless governments took steps to stabilize market economies at full employment, much of the undoubted benefit of markets would be lost and political space would be opened up for extremists who would offer to solve the economic problem by abolishing markets, peace and liberty. This in a nutshell was the Keynesian 'political economy'. Keynes offers an immensely fruitful way of making sense of the slump now in progress, for suggesting policies to get us out of the slump, for ensuring, as far as is humanly possible, that we don't continue to fall into pits like the present one, and for understanding the human condition. These are the things which make Keynes fresh today.

Keynes was one of those rare persons who can both think and act at the highest level. His life falls into cycles or phases, in which the emphasis shifts from one to the other. These shifts were related to what was happening in the world. At some times, particularly during the two world wars, there was a greater demand for Keynes's practical genius, and a greater satisfaction to be had from exercising it. But the cycles can also be seen in terms of action and reaction. Periods of great intellectual effort demand their release in practical activity, while practical activity prompts, sooner or later, a yearning for the cloister. Before 1914, Keynes's desire for the cloister was uppermost, partly because he was at this period most under the immediate influence of Moore's philosophy, partly because the nature of his sexual relations fitted private life better than public life ― a point of considerable importance even today, but more so then, when homosexual acts were illegal, and the danger of blackmail much greater.