conflicting elements of different topics, at
the same time. The doxastic world can be an impossible world. I shall, however, largely ignore
1.2 Pyrrhonianscepticism 21
The two types of problem give rise to two quite different types of scep-
ticism, which I
being full of uncertainty cannot decide the issue of our dispute.
It will have to be Reason, then. But no Reason can be established except by another
Reason. We retreat into infinity.
In the light of this, it is tempting to try to overthrow Pyrrhonianscepticism by
showing that we can attain at