A quotation by Edmund Landau
[Asked for a testimony to the effect that Emmy Noether was a great woman mathematician, he said:]
I can testify that she is a great mathematician, but that she is a woman, I cannot swear.
Quoted in J E Littlewood, A Mathematician's Miscellany, 1953.
It gives me the same pleasure when someone else proves a good theorem as when I do it myself.
Quoted in D MacHale, Comic Sections (Dublin 1993)