Schopenhauer's Biophilosophy

Schopenhauer uses what he calls empirical metaphysics, to give an explanation of the essence of the world, and of living things. In doing so, he always tries to make interpretations which are grounded in the sciences. But since all sciences use the principle of sufficient reason, and restrict their observations to the phenomenal world, they can never get to what things are in themselves. There would be no way to do so, if Schopenhauer were not, as a philosopher, himself both a knower and a ...