[⑥] Hans Sluga & David G. Stem (ed) The Cambridge Companion to Wittgenstein, Cambridge: Cambridge University Press, 1996, p.327.
[⑦] Henry Leroy Finch, Wittgenstein, The Early Philosophy: An Exposition of the “Tractatus”, Atlantic Highlands, N.J.: Humanities Press, 1971, p. 265.
[⑧] M. O’C. Drury, “Some Notes on Conversations with Wittgenstein”, Portraits of Wittgenstein, Volume 3, p. 174。参见John Hayes, “Wittgenstein, Religion, Freud and Ireland”, Portraits of Wittgenstein, Volume 4, p. 76。
[⑨] Knut E. Tranoy, “Wittgenstein in Cambridge 1949-1951: Some Personal Recollections”, Portraits of Wittgenstein, Volume 4, p. 127。
[⑩] M. O’C. Drury, “Conversations with Wittgenstein”, Portraits of Wittgenstein, Volume 3, p. 206。
[11] 康德的《实践理性批判》对托尔斯泰的影响，以及托尔斯泰的伦理和宗教思想对维特根斯坦的影响，在此就不赘述了。
[12] 康德：《纯粹理性批判》，李秋零译，北京：中国人民大学出版社，2004，17页。以下随正文标A、B版及此中译本页码。
[13] Sebastian Gardner, Kant and the Critique of Pure Reason, Routledge, 1999, p. 23.
[14] Heidegger, The Metaphysical Foundations of Logic, trans. Michael Heim, Bloomington: Indiana University Press, 1984, p. 1.