Full Idea
The Pythagoreans offered definitions of a limited range of things on the basis of numbers; examples are timeliness, justice and marriage.
Gist of Idea
Pythagoreans define timeliness, justice and marriage in terms of numbers
Source
report of Pythagoras (reports [c.530 BCE]) by Aristotle - Metaphysics 1078b
Book Reference
Aristotle: 'Metaphysics', ed/tr. Lawson-Tancred,Hugh [Penguin 1998], p.402