"My life has been dominated by my differences with John Maynard Keynes. That turns almost wholly on the - I believe, false - conviction that there is a simple relationship between aggregate demand for consumer goods and the volume of employment. Keynes was one of the most intelligent people I knew but he understood very little economics. He must not be blamed for his disciples. He knew the danger of inflation."
January 1, 1970
https://en.wikiquote.org/wiki/John_Maynard_Keynes_and_Friedrich_Hayek