Abel has left mathematicians enough to keep them busy for 500 years.

I turn aside with a shudder of horror from this lamentable plague of functions which have no derivatives.

We are servants rather than masters in mathematics.

There exists, if I am not mistaken, an entire world which is the totality of mathematical truths, to which we have access only with our mind, just as a world of physical reality exists, the one like the other independent of ourselves, both of divine creation.

It is not enough to be busy. So are the ants. The question is: What are we busy about?

As an actor, you're never busy enough.