Question 1

What is the best book to start with?

Accepted Answer

'The Fixation of Belief', Popular Science Monthly, 1877. Short and a perfect critical-thinking text.

Question 2

What is the most famous quote?

Accepted Answer

This library does not measure fame, and it does not rank lines by how often they are shared. The first line it files for Charles Sanders Peirce that is not marked Questionable or Misattributed is “Do not block the way of inquiry.” ('F.R.L.' [First Rule of Logic], c. 1899; Collected Papers 1.135–136, Well attested).

Question 3

What is the most misquoted line?

Accepted Answer

None of the lines this library files for Charles Sanders Peirce is marked Misattributed or Questionable. That is a fact about these cards, not a certificate that every popular sentence is theirs.

Question 4

What is one key idea, in a sentence?

Accepted Answer

Pragmatic maxim: Meaning lies in conceivable practical effects.