Letters 65.23

To return to our subject; this freedom will be greatly helped by the contemplation of which we were just speaking. All things are made up of matter and of God; God controls matter, which encompasses him and follows him as its guide and leader. And that which creates, in other words, God, is more powerful and precious than matter, which is acted upon by God.

Seneca, Letters to Lucilius 65.23, translated by Richard Mott Gummere