To predict tomorrow's weather, I need not take into account the state of mind of the Emperor of Manchukuo. - A. J. Ayer

There never comes a point where a theory can be said to be true. The most that one can claim for any theory is that it has shared the successes of all its rivals and that it has passed at least one test which they have failed.

There is philosophy, which is about conceptual analysis — about the meaning of what we say — and there is all of this … all of life.

...His argument, as set out in The Problems of Philosophy, was based on the empirical fact that we are not only aware of things but are also, very frequently, aware of being aware of them.