You can tell whether a man is wise by his questions.
— Gerhard Hauptmann (1862–1946)
First doubt, then inquire, then discover!
— Henry Thomas Buckle (1821–1862)
Education is the kindling of a flame, not the filling of a vessel.
— Heraclitus (approx. 540– 480 BC)
Everything in the world is only there for the person who has eyes to see it.
— Eduard Spranger (1882–1963)
An investment in knowledge always pays the best interest.
— Benjamin Franklin (1706–1790)