Change can take place only when liberal and radical...

Change can take place only when liberal and radical pressures are both strong. Intelligent liberals have always recognized the debt they owe to radicals, whose existence permits liberals to push further than they would otherwise have dared, all the while posing as compromisers and mediators. Radicals, however, have been somewhat less sensible of their debt to liberals, partly because of the rather single-minded discipline radicals are almost forced to maintain, plagued as they always are by liberal backsliding and timidity on the one hand and various forms of self-destructiveness and romantic posing on the other.... Liberal reforms and radical change