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David Hume, an empiricist, separated knowledge into categories - "matters of fact" and "relations of ideas". Hume argues that every affirmation which is certain, such as geometry, arithme...

The difference between ethical naturalism and non-naturalism is a difference between the definiton of a moral fact. Ethical naturalism purports to explain ethical langague in terms of fact-stating semantics ...

Descartes went through three increasingly strong arguments in an attempt to bring doubt to every single thing that he knew. The first is the argument from illusion, in which he suggests that his senses may d...

Previously in his meditations Decartes attempts to question everything he takes to be given as true through methodological skepticism. He finds that everything in the world around him can be questioned, but ...

Kant's kategorical imperative is a maxim - a rule - which states that all your actions must be such that they could creature the foundation for a law about how everyone ought to act in similar situations. In...