Metaphysical knowledge

Metaphysical knowledge is accessible and indeed, we have such a knowledge. Metaphysics should be done directly, without starting with considerations of philosophy of language or philosophy of mind. The two main critiques of metaphysics are evolutionary naturalism and Kantianism. Naturalism is inconsistent because it denies any possibility to make metaphysical hypotheses, but it hinges upon such hypotheses. Kant is also inconsistent because one cannot avoid the question of the content of thoughts once metaphysics has been reduced to epistemology. A scrutiny of arguments by Barcan and Kripke confirms the possibility of a purely metaphysical argumentation and the impossibility to do without it.