Opinion we may have, but certainty and knowledge are impossible. We can be certain of nothing, not even of the most trivial assertions. Therefore we ought never to make any positive statements on any subject. And the Pyrrhonists were careful to import an element of doubt even into the most trifling assertions which they might make in the course of their daily life. This absence of certainty applies as much to practical as to theoretical matters.
Nothing is in itself true or false.
It only appears so. In the same way, nothing is in itself good or evil. It is only opinion, custom, law, which makes it so. All action is the result of preference, and preference is the belief that one thing is better than another. If I go to the north, it is because, for one reason or another, I believe that it is better than going to the south.