… is from page 58 of Hayek’s 1988 volume, The Fatal Conceit:
Although Keynes was, in spite of himself, to contribute greatly to the weakening of freedom, he shocked his Bloomsbury friends by not sharing their general socialism; yet most of his students were socialists of one sort or other. Neither he nor these students recognized how the extended order must be based on long-run considerations.
And thus the great appeal of Keynesianism to politicians.