If there is no contradictory impression, there is nothing to awaken reflection
Aspiring minds must sometimes sustain loss.
Let no-one ignorant of geometry enter. Said to have been inscribed above the door of Plato's Academy.
Mathematics is like draughts in being suitable for the young, not too difficult, amusing, and without peril to the state.
The blame is his who chooses: God is blameless.
Wonder is the feeling of the philosopher, and philosophy begins in wonder.