Even logical positivists are capable of love.

I see philosophy as a fairly abstract activity, as concerned mainly with the analysis of criticism and concepts, and of course most usefully of scientific concepts.

No moral system can rest solely on authority.

Why should you mind being wrong if someone can show you that you are?

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

We say that a sentence is factually significant to any given person, if, and only if, he knows how to verify the proposition which it purports to express.

The ground for taking ignorance to be restrictive of freedom is that it causes people to make choices which they would not have made if they had seen what the realization of their choices involved.