Full Idea
The nature of number and harmony admits of no falsehood; for this is unrelated to them. Falsehood and envy belong to the nature of the Unlimited and the Unintelligent and the Irrational.
Gist of Idea
There is no falsehood in harmony and number, only in irrational things
Source
Philolaus (On the Cosmos (lost) [c.435 BCE], B11), quoted by (who?) - where?
Book Reference
'Ancilla to the Pre-Socratic Philosophers', ed/tr. Freeman,Kathleen [Harvard 1957], p.75