… is from page 41 of F.A. Hayek’s February 23, 1944, speech to the Students’ Union of the London School of Economics, “On Being An Economist,” as this address is printed in the 1991 collection, The Trend of Economic Thinking, which is Vol. 3 in The Collected Works of F.A. Hayek:
[I]t requires much greater strength and independence of mind to take a critical view of what you have been taught to be progressive than merely to accept them.
