One cannot conceive anything so strange and so implausible that it has not already been said by one philosopher or another. Rene Descartes
There is nothing so absurd or ridiculous that has not at some time been said by some philosopher. Oliver Goldsmith
When the philosopher’s argument becomes tedious, complicated, and opaque, it is usually a sign that he is attempting to prove as true to the intellect what is plainly false to common sense. Edward Abbey
A philosopher who is not taking part in discussions is like a boxer who never goes into the ring. Ludwig Wittgenstein