The total subject of mathematics is clearly too broad for any of us. I do not think that any mathematician since Gauss has covered it uniformly and fully; even Hilbert did not and all of us are of considerably lesser width quite apart from the question of depth than Hilbert.

Truth is much too complicated to allow anything but approximations.

With four parameters I can fit an elephant, and with five I can make him wiggle his trunk.

There's no sense in being precise when you don't even know what you're talking about.

All stable processes we shall predict. All unstable processes we shall control.

You don't have to be responsible for the world that you're in.

The most vitally characteristic fact about mathematics is, in my opinion, its quite peculiar relationship to the natural sciences, or more generally, to any science which interprets experience on a higher than purely descriptive level.