In Unancestral Voice Barfield cautions us to keep in mind that "Evolution is a process of transformation: and you can never understand transformation in terms of duality--in terms of the state of affairs before the state of affairs after the transformation--the first causing the second. You can only understand it in terms of an immaterial transforming agent, which is there both before and after the change" (UV 78-79).
"Where there is a total transformation of the
material form," he goes on to say, "the something that persists must itself
be immaterial" (UV 96).