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You could attach prices to thoughts. Some cost a lot, some a little. And how does one pay for thoughts? The answer, I think, is: with courage.

"Culture and Value" by Ludwig Wittgenstein, translated by Peter Winch, (p. 52e), 1980.
You could attach prices to thoughts. Some cost a lot, some a little. And how does one pay for thoughts? The answer, I think, is: with courage.