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The question about why is there anything at all instead of nothing has been raised or commented on by philosophers including Gottfried Wilhelm Leibniz , Martin Heidegger − who called it the fundamental question of metaphysics − and Ludwig Wittgenstein .
 Gottfried Wilhelm Leibniz, Martin Heidegger, Ludwig Wittgenstein
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 Gottfried Wilhelm Leibniz, Martin Heidegger, Ludwig Wittgenstein