I don't believe in anything but the existence of my sensation; I have no other certainty, not even of the outer universe conveyed to me by those sensations, of my prossesor in my PC.

I don't see the outer universe,
I don't hear the outer universe,
I don't touch the outer universe,
I don't understand my PC,
I don't understand the language,

Because I am a rabbit...
And I don't understand at all.