Without the idea of truth,
but with pu
I can still use my rationality.

For practical matters,
for investigation.

I can say,
my research is valid for this specific part of the human body
but the other matter I have not investigated yet and is still pu

Or Ma'am, you have a disease that we do not know, it is still pu.
If you are experiencing it, it exists for you, but we do not know it yet.

Or How do I deal with this project it is still largely pu.
I am just going to start writing down the outline.

It means that I realistically look at what I know and what remains pu.

It makes me more aware of that I do not know yet,
And sometimes I can do something about it.

Realism makes clear what I know and can control and what not.
It makes clear that I cannot use rationality to give a meaning to it all.

To give meaning relates to existing and creation in the complex world,
in the cause and effect turbulence.

It makes it clear to me that I cannot use reason
to truly understand the truth.

And that I cannot use reason
to determine how I have to act in this world.