 Moreover, as inner perception and memory as sources of experience are limited to one’s own mental life, they have to be complemented with the “indirect knowledge of the mental phenomena of others” [“indirekte Erkenntnis fremder psychischer Phänomene”], which we can gain on the basis of the manifest behavior we can observe in others, including their verbal behavior, i.e., when “a person describes them directly in words.” (PES 28) [“jemand geradezu in Worten sie beschreibt”] (PES 53). 