Sacramentum Mundi Online

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(2,891 words)

1. The principle of identity. The identity of each thing with itself is taken to be the most simple and obvious principle of all logic and philosophy. Without the principle of identity (A = A) there could be no unambiguous and consistent thought and language. Nonetheless, identity is not an experience reflecting external objects. It is given in the self-experience of the human subject. In the consciousness of self, the Ego knows itself as the self which persists throughout all the changes which affe…

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Walter Kern, “Identity-Philosophy”, in: Sacramentum Mundi Online, General Editor Karl Rahner, SJ. Consulted online on 25 September 2023 <>
First published online: 2016

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