De Somniis (lib. i-ii)

Know, then, O excellent man, that God alone is the truest, and most real, and genuine peace, and that every created and perishable essence is continual war. For God is something voluntary, and mortal essence is necessity. Whoever, therefore, is able to forsake war, and necessity, and creation, and destruction, and to pass over to the uncreated being, to the immortal God, to the voluntary principle, and to peace, may justly be called the abode and city of God.

Do not, therefore, consider it a different thing whether you speak of the sight of peace or the sight of God, as they are the same thing; because peace is not only the companion but also the chief of the powers of the living God, which are distinguished by many names.