“Deconstruction holds that nothing is ever entirely itself. There is a certain otherness lurking within every assured identity. It seizes on the out-of-place element in a system, and uses it to show how the system is never quite as stable as it imagines. There is something within any structure that is part of it but also escapes its logic.”
Terry Eagleton, Rev. of Derrida: A Biography, by Benoît Peeters. The Guardian 14 November 2012