Continuing in Bossuet’s Elevations on the Mysteries, 1,4:
Hear, Israel: the Lord your God is one God, because he is who is, he who is indivisible. All which is not perfect, degenerates from perfection. Thus the Lord your God being the perfect one is alone and there is no other God but him. All that is not him who is by his essence and nature, is not and will not be eternal, if he who is along does not give him being.
If there is more than one God, there will be an infinity of them: if there is an infinity, there are none: because each is not what he is, and are finite, and there will be no point where the infinite is not lacking, or it would be necessary to hear one who has all and who from that will be alone. Hear Israel: hear at your deepest, do not hear from the place where fantasies are forged. Hear from the place where the truth is heard, where one puts together pure and simple ideas. Hear there, Israel, and there, in the secret of your heart where truth is heard, keep this word without noise: The Lord your God is one God alone: before him the heavens are not: all is before him as it were not: all is counted for nothing, like a void, like a pure inanity, because he is who is, who sees all, who knows all, who does all, who orders all and calls that which is not as if it were.