Popper on Certain Truth

Popper actually left a bit of room for doubt about the non-existence of ‘certain truth.’ Here is the quote:

As soon as we take objective knowledge into account, we must say that at best only a very small part of it can be given anything like sufficient reasons for certain truth: it is that small part (if any) which can be described as demonstratable knowledge and which comprises (if anything) the propositions of formal logic and of (finite) arithmetic.

Objective Knowledge, p. 75

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