The World as Will and Idea (Complete, Volumes I-III)

His doctoral thesis on the four ways we explain anything, which he called the key to his whole system, together with On the Will in Nature, where he tests his metaphysics against the science of his day. Hillebrand's revised translation.

Arthur Schopenhauer

The prize essay where Schopenhauer takes apart Kant's ethics of duty and grounds morality in compassion instead. Bullock's translation, with his introduction and notes.

Arthur Schopenhauer