Reason Not The Only Source of Knowledge
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With an account, you can revise, criticize, and comment on ideas.Ayn Rand claims that "[t]he virtue of Rationality means the recognition and acceptance of reason as one's only source of knowledge [...]." This is wrong, mainly because reason can only be used as a method of choosing between knowledge/ideas, not as the only source of knowledge.
What do you think is the source of knowledge if not reason?
The source of knowledge is myths. Reason criticizes them and we get myths that are testable (if knowledge about the physical world), hard to vary and make some assertion about reality. Popper highlighted the myth and testable nature of scientific knowledge, and Deutsch highlights hard to vary and explanation/assertion nature of knowledge.
Criticism is a form of knowledge. How does reason have access to criticism if reason is not the source of knowledge?
This misses the point of the post before it. Knowledge starts as myths and contains myths. Reason makes it hard to vary, thus reasonable to take as true until the myths in that theory itself are corrected.