"As the geometrician, who endeavours
To square the circle, and discovers it not,
By taking thought, the principle he wants,

Even such was I at that new apparition;
I wished to see how the image to the circle
Conformed itself, and how it there finds place;

But my own wings were not enough for this,
Had it not been that then my mind there smote
A flash of lightning, wherein came its wish.

Here vigour failed the lofty fantasy:
But now was turning my desire and will,
Even as a wheel that equally is moved,

The Love which moves the sun and the other stars."
- Dante, Paradisio