ABSTRACT

But definitions are not important. And quibbling over words is a menace.

(7) We can assert the truth, attain the truth, often enough. But we can never attain certainty. For we know - in the sense of conjectural knowledge - that there are people with a delusion that they are Einstein or a reincarnation of Goethe. So presumably I speak the truth when I say that I am just now giving a lecture in Zurich. But from my experience of such people, I cannot be absolutely sure that I am not caught up in some similarly terrible mistake.