Full Idea
Understanding moves from things less intelligible by nature to things more so.
Gist of Idea
Understanding moves from the less to the more intelligible
Source
Aristotle (Metaphysics [c.324 BCE], 1029b02)
Book Reference
Aristotle: 'Metaphysics', ed/tr. Lawson-Tancred,Hugh [Penguin 1998], p.176
A Reaction
The interesting phrase is 'by nature'. Whether things are intelligible or not is a feature of the natural world, and not just a feature of the mind's capacities.