Bertrand Russell

de bene esse: literally, of well-being, morally acceptable but subject to future validation or exception

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Bertrand Russell on Ludwig Wittgenstein

"He was perhaps the most perfect example I known of genius as traditionally conceived, passionate, profound, intense, and dominating. He had a kind of purity which I have never known equalled except by G.E.Moore.

He used to come to see me every evening at midnight, and pace up and down the room like a wild beast for three hours in agitated silence. Once I said to him: 'Are you thinking about logic, or about your sins?' 'Both', he replied, and continued his pacing. I did not like to suggest it was time for bed, for it seemed probable both to him and to me that on leaving me he would commit suicide."

-Bertrand Russell Autobiography, Chapter 9, 1959