I remember the first time I saw him. Arnold Toynbee (who was a kind of pious fraud, he was so famous) was visiting, and everyone was sitting there, so thrilled to see the great man. Frank Knight came stalking in late and sat down noisily. Toynbee was saying, "Now, we men are all brothers and that's because there is the fatherhood of God." Finally, Knight said -- just loudly enough for everybody to hear -- "Where do you get that shit?" He really cared about the issue, whereas Milton Friedman is indifferent to it. To Friedman, whether to believe in God or not to believe in God is a preference. For Frank Knight it clearly was the question. Somehow I feel a little of Frank Knight in Professor [James] Buchanan."
(p198, in "From Political Economy to Economics -- And Back?", 1990)