From Eugenia Cheng's Beyond Infinity, Chapter 4:

I truly believe that trying to explain everything isn't the point. Rather, the point is to explain as much as we can, and, importantly, to be clear where the boundary is between what we can and can't explain. In my mind's eye, the sphere of things we can logically explain is at the center of the universe of ideas, and the aim of mathematics is to move as much as possible into that sphere. So the sphere is always expanding, and as it does so, its surface keeps growing. The surface is where the explicable and the inexplicable meet. ...

^z - 2017-08-20