How hard I find it to see what is right in front of my eyes!

All mathematics is tautology.

The process of induction is the process of assuming the simplest law that can be made to harmonize with our experience.

The classifications made by philosophers and psychologists are like trying to classify clouds by their shape.

If you tried to doubt everything you would not get as far as doubting anything. The game of doubting itself presupposes certainty.

Hegel seems to me to be always wanting to say that things which look different are really the same. Whereas my interest is in showing that things which look the same are really different. I was thinking of using as a motto for my book a quotation from King Lear: 'I’ll teach you differences'. ... 'You’d be surprised' wouldn’t be a bad motto either.

It is one of the chief skills of the philosopher not to occupy himself with questions which do not concern him.