Just be indipendent of the external world, so you don't have to fear for what's in it.

Philosophy is like trying to open a safe with a combination lock: each little adjustment of the dials seems to achieve nothing, only when everything is in place does the door open.

Nothing is more important for teaching us to understand the concepts we have than to construct fictitious ones.

[M]an is fulfilling the purpose of existence who no longer needs to have any purpose except to live. That is to say, who is content.

Telling someone something he does not understand is pointless, even if you add that he will not be able to understand it.

Architecture immortalizes and glorifies something. Hence there can be no architecture where there is nothing to glorify.

The so-called law of induction cannot possibly be a law of logic, since it is obviously a proposition with a sense.--Nor, therefore, can it be an a priori law.