The advice we give others is the advice that we ourselves need.
How did he do it? He must be a genius!
Theorems are not to mathematics what successful courses are to a meal.
Nature imitates mathematics.
Our faith in Mathematics is not likely to wane if we openly acknowledge that the personalities of even the greatest mathematicians may be as flawed as those of anyone else.
Are mathematical ideas invented or discovered? This question has been repeatedly posed by philosophers through the ages and will probably be with us forever.