Full Idea
If the prime origin is destroyed, it will not come into being again out of anything.
Gist of Idea
If the prime origin is destroyed, it will not come into being again out of anything
Source
Plato (Phaedrus [c.366 BCE], 245d)
Book Reference
Plato: 'Phaedrus and Letters VII and VIII', ed/tr. Hamilton,Walter [Penguin 1973], p.49
A Reaction
This is the essence of Aquinas's Third Way of proving God's existence.