On "The Origin of the Knowledge of Right and Wrong" (1889). What justifies basic moral facts? Brentano claims that right there in our experience, we can rationally sense with complete certainty that certain kinds of preferences are good ones, and others are not. This take on intuitionism is a response to Kant that (like Kant) cuts between the traditional epistemic categories of rationalism and empiricism, and Brentano's descriptive psychology kicked off the whole project of phenomenology.

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