always escaping

"At such a distance, the swimmer was always escaping him. He would see him, then lose sight of him, though he had the feeling that he was following his every move: not only perceiving him clearly all the time, but being brought near him in a completely intimate way, such that no other sort of contact could have brought him closer. He stayed a long time, watching and waiting. There was in this contemplation something painful which resembled the manifestation of an excessive freedom, a freedom obtained by breaking every bond."

Maurice Blanchot, Thomas the Obscure, from The Station Hill Blanchot Reader, p.57.

unconceptualisable

"While Saussure had gone to great pains to show that language in its most general form could be understood as a system of differences, 'without positive terms', Derrida noted that the full implications of such a conception were not appreciated by either latter-day structuralists, or Saussure himself. Difference without positive terms implies that this dimension in language must always remain unperceived, for strictly speaking, it is unconceptualisable."

John Lechte, Fifty Key Contemporary Thinkers, Jacques Derrida p107.