He claimed that "every action can only take place in consequence of a sufficient motive" in one work, which also claims that "moral laws...cannot rightly be assumed as existing without proof".  
He claimed that "every action can only take place in consequence of a sufficient motive" in one work, which also claims that "moral laws...cannot rightly be assumed as existing without proof".  In addition to On the Basis of Morality, this author wrote "To preach Morality is easy, to found it different" in a work which discusses how "it must be possible for phenomenon to act upon things from inside, instead of from outside" in a section entitled "Animal Magnetism and Magic".  This author of On the Will in Nature also wrote a work which claims that the "Ontological Proof is really a charming joke" and that "the immensity of God from which it follows that God needs no cause", his On the Fourfold Root of the Principle of Sufficient Reason.  For 10 points—name this philosopher, who criticized Kantian philosophy and discussed electricity and gravity as fundamental forces of the first title concept in his The World as Will and Representation.
He claimed that "every action can only take place in consequence of a sufficient motive" in one work, which also claims that "moral laws...cannot rightly be assumed as existing without proof".  
Arthur {Schopenhauer}