A science of all these possible kinds of space [the higher dimensional ones] would undoubtedly be the highest enterprise which a finite understanding could undertake in the field of geometry... If it is possible that there could be regions with other dimensions, it is very likely that God has somewhere brought them into being.

There is no virtue in penance and fasting which waste the body; they are only fanatical and monkish.

Do what is right, though the world may perish.

The possession of power inevitably spoils the free use of reason.

Art does not want the representation of a beautiful thing, but the representation of something beautiful.

From such crooked wood as that which man is made of, nothing straight can be fashioned.

Natural science physics contains in itself synthetical judgments a priori, as principles. ... Space then is a necessary representation a priori, which serves for the foundation of all external intuitions.