Ego vs Pseudo-Ego II

I think therefore I am.

If I cease to think I shall cease to be.

How do I know that the whole world is not illusionary?

I don't.

So I think.

Very hard.

So even if it is, I have gained value.

Because I do stuff, I know I do.

If I stopped doing stuff, I wouldn't know about the stuff.

But how do I know, I'm not a brain in a jar?

I don't.

So I keep doing stuff.

Lots of it.

What have I got to lose?