 The last part of the passage emphasizes two conditions: a belief condition, expressed in terms of conviction, and a justification condition, expressed in terms of indubitability or unshakability – “conviction based on a reason so strong that it can never be shaken by any stronger reason.” Conspicuously missing is any further condition stipulating that the conviction must be true. The passage does clarify, of anything that would count as perfect knowledge, that it is “completely accepted as true”; that we are “convinced that it is true,” indeed, that we are “firmly convinced.” But these remarks speak to the belief condition, not the justification condition. Indeed, the passage is plausibly read even more strongly: i.e., not merely as omitting mention of a truth condition, but as confirming some broad possibility that what we regard as indubitable truths are, “absolutely speaking, false.”