Is there any knowledge in the world which is so certain that no reasonable man could doubt it?
The Problems of PhilosophyIt must be an odd person indeed that can say for certain they are normal.
Percipience: Outside the Range of Understood SenseAnyone who takes a decided line in certain matters, is sure to lead all the rest.
Tom Brown at OxfordWithin certain limits, it is actually true that the less money you have, the less you worry.
Down and Out in Paris and London