If the justificatory act and the necessary truth are both immune to revision under rational reflection, Chisholm's requirement that infallible belief tolerates no error-possibility is fully met.

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Chisholm(as a philosopher being cited): Roderick Chisholm, an important 20th-century American philosopher who argued for essentialism (the view that things have properties they must have).
Immune to revision(describing whether beliefs can be questioned): Protected from being changed or proven wrong, even when faced with new evidence or arguments.
error-possibility(what infallible belief supposedly has none of): The chance or potential that something could be wrong or mistaken.
infallible belief(Used in accounts of foundational epistemic justification; criticized for being too broad.): A belief in proposition P such that believing P entails that P is true.
justificatory act(one of the two things said to be immune to revision): The process or action of giving a good reason or proof for why you believe something is true.
necessary truth(Mill's empiricist reinterpretation of modal concepts): A proposition whose denial seems inconceivable, explained by Mill not as a metaphysical fact but as a result of psychological association making the proposition deeply ingrained.
rational reflection(in epistemology and ethics): Carefully thinking through your options using logic and reason, rather than just acting on impulse.

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