
Note in the appendix of Grundlagen der Arithmetik (Vol. 2) after Frege had received a letter of Bertrand Russell in which Russell had explained his discovery of, what is now known as, Russell's paradox.
Grundgesetze der Arithmetik, 1893 and 1903
The Deception: Animal Faith (p. 55)
Straw Dogs: Thoughts on Humans and Other Animals (2002)
Note in the appendix of Grundlagen der Arithmetik (Vol. 2) after Frege had received a letter of Bertrand Russell in which Russell had explained his discovery of, what is now known as, Russell's paradox.
Grundgesetze der Arithmetik, 1893 and 1903
Philosophy : the basics (Fifth Edition, 2013), Introduction
Source: Presocratic Philosophy: A Very Short Introduction (2004), Ch. 4 : Reality and appearance: more adventures in metaphysics
Freedom for Über-Marionettes: What Science Won't Tell You (p. 151)
The Soul of the Marionette: A Short Enquiry into Human Freedom (2015)
The Spiral Dance: A Rebirth of the Ancient Religion of the Goddess (1979)
Source: The Complex Vision (1920), Chapter I
Context: My answer to the question "Why do we philosophize?" is as follows. We philosophize for the same reason that we move and speak and laugh and eat and love. In other words, we philosophize because man is a philosophical animal.… We may be as sceptical as we please. Our very scepticism is the confession of an implicit philosophy.