It only interests me as a means for studying psychology.

The history of philosophical systems is a history of the development of the mind of humanity.

The systems are only valuable as testimonials to the endless extent and possibility of human thought.
All the systems put together do not contain a spark of objective truth." "That is upon the whole the difference between natural science and metaphysics," said Schrotter.

"Science regulates the boundary between what is known and what is not known, and declares when the limit is reached.

Our knowledge has attained to a certain point, and beyond that we know and understand nothing, absolutely nothing.