For things which are worthy of God will prove the existence of God. We maintain that God must first be known from nature, and afterwards authenticated by instruction: from nature by His works; by instruction, through His revealed announcements.
Digna enim deo probabunt deum. Nos definimus deum primo natura cognoscendum, deinde doctrina recognoscendum, natura ex operibus, doctrina ex praedicationibus.
Original text (Latin)
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Notes from Wikiquote
Book I, Chapter XVIII.—Notwithstanding Their Conceits, the God of the Marcionites Fails in the Vouchers Both of Created Evidence and of Adequate Revelation. | Galileo Galilei: Letter to the Grand Duchess Christina of Tuscany, 1615
Variants
We conclude that God is known first through Nature, and then again, more particularly, by doctrine; by Nature in His works, and by doctrine in His revealed word.