czysty rozum

So difficult is it to guide ourselves by the human faculty of pure reason.

In short, we cannot assume that higher education is a site of pure reason.

It is only by pure reason, therefore, that duty can and must be prescribed.

Let us consider the problem in the light of pure reason.

What do you think of pure reason and its fruit?

Do you need a purer reason to fight them than what they are?

The general problem: How is knowledge from pure reason possible?

In so doing, we learn the limits of pure reason.

This tribunal is nothing less than the critical investigation of pure reason.

In the judgements of pure reason, opinion has no place.