Actually most of that chapter is spent talking about Roxy Music's own position as a Glam group, but there is a quotation later on, from 1999:

'There doesn't ever seem to be any self-doubt with Bowie and this is to be commended. He seems to be very good at getting the best out of himself. I'm always riddled with doubts and self-criticism.'

There was also a brief mention that Bowie telephoned Ferry just prior to Pinups, when they were both working on cover albums, so they appear friendly enough.

Well, I cried for you - now it's your turn to cry a while