John asked:

What do you consider to be the most important questions of metaphysics?

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According the Heidegger in his Introduction to Metaphysics(1953) the first question is: "Why are
there things that are, rather than nothing?" Heidegger means 'first' in a metaphysical sense not a
chronological sense; he thinks that this is the most underlying of all questions. This is not just his
idea, it comes from (his interpretation of) Aristotle. All our answers to every other philosophical
question presuppose the way in which we have resolved the Seinsfrage(question of the Being of
beings). The question of being is the most important question of metaphysics.

Matthew Del Nevo
www.sicetnon.com