A quotation by James Whitbread Lee Glaisher
The mathematician requires tact and good taste at every step of his work, and he has to learn to trust to his own instinct to distinguish between what is really worthy of his efforts and what is not.
Quoted in H Eves Mathematical Circles Squared (Boston 1972).
[Lord Brougham's writings on the bee's cell contain] as striking examples of bad reasoning as are often to be met with in writings related to mathematical subjects.
Quoted in D'A W Thompson On Growth and Form (Cambridge 1917)