• A heavy warning used to be given that pictures are not rigorous; this has never had its bluff called and has permanently frightened its victims into playing for safety.

    John Edensor Littlewood: A heavy warning used to be given that pictures are not rigorous; this has never had its bluff called and has permanently frightened its victims into playing for safety.
    John Edensor Littlewood, Béla Bollobás (1986). “Littlewood's Miscellany”, p.54, Cambridge University Press