| Sumario: | Sometimes a proposition is 'opaque' to an agent: (s)he doesn't know it, but (s)he does know something about how coming to know it should affect his or her credence function. It is tempting to assume that a rational agent's credence function coheres in a certain way with his or her knowledge of these opaque propositions, and I call this the 'Opaque Proposition Principle'. The principle is compelling but demonstrably false. I explain this incongruity by showing that the principle is ambiguous: the term 'know' as it appears in the principle can be interpreted in two different ways, as either basic‐know or super‐know. I use this distinction to construct a plausible version of the principle, and then to similarly construct plausible versions of the Reflection Principle and the Sure‐Thing Principle.
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