Neither moral relations nor the moral law can swing in vacuo. Their only habitat can be a mind which feels them; and no world composed of merely physical facts can possibly be a world to which ethical propositions apply.
William JamesBoth thought and feeling are determinants of conduct, and the same conduct may be determined either by feeling or by thought.
William JamesTrue is the name for whatever idea starts the verification process, useful is the name for its completed function in experience
William James