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Published online by Cambridge University Press: 01 January 2020
1 For further details, see my Res Cogitans (Ithaca and London: Cornell University Press, 1972), Chapter V.
2 I changed the plural suffixes into singular ones.
3 Probably, the verb believe originally marked one's attitude towards what someone else has said: believe it. Later on it encroached upon the domain of think: believe so. We still have: I believe him, but not I think him.