Freedom is that faculty that enlarges the usefulness of all other faculties.
[R]eason is... given to us as a practical faculty, that is, as one that influences the will.
All human knowledge begins with intuitions, proceeds from thence to concepts, and ends with ideas.
An action, to have moral worth, must be done from duty.
Animals... are there merely as a means to an end. That end is man.
It is often necessary to make a decision on the basis of knowledge sufficient for action but insufficient to satisfy the intellect.