I never make stupid mistakes. Only very, very clever ones.

John Peel (b. 1954) British writer [pen names Nicholas Adams, Rick North, J.P. Trent, John Vincent]

Timewyrm: Genesys, ch. 10 [The Doctor] (1991)
    (Source)

Part of Virgin's "Doctor Who New Adventures" book series, which came out after the 1963 version of the TV show was canceled. Note that some sites misattribute this book to another Doctor Who novelist, David A. McIntee.