Hayek on why he didn’t critique Keynes’s General Theory when it was first published:
“I spent a lot of time criticizing his Treatise on Money, which came out before the General Theory, in two long journal articles.
But when I published the second one, Keynes told me, ‘Oh, never mind, I no longer believe that.’ So when he came out with his General Theory, I thought I was not going to waste my time criticizing.
But that book was the one which became so frightfully important. I regretted for the rest of my life that I did not return to the charge then.”