Full Idea
They say that the substance of existing things being of itself motionless and shapeless must be put in motion and shape by some cause.
Gist of Idea
The original substance lacked motion or shape, and was given these by a cause
Source
Sextus Empiricus (Against the Physicists (two books) [c.180], I.075)
Book Reference
Sextus Empiricus: 'Against the Physicists/Against the Ethicists', ed/tr. Bury,R.G. [Harvard Loeb 1997], p.43
A Reaction
Interestingly, Sextus doesn't seem to think that the existence of the original substance also needs a cause. This substance sounds like a relative of Aristotle's Prime Matter. The source of motion isn't really a 'design' argument.