John Calvin on Exodus 3:14

14. I am that I am. The verb in the Hebrew is in the future tense, “I will be what I will be;” but it is of the same force as the present, except that it designates the perpetual duration of time. This is very plain, that God attributes to himself alone divine glory, because he is self-existent and therefore eternal; and thus gives being and existence to every creature. Nor does he predicate of himself anything common, or shared by others; but he claims for himself eternity as peculiar to God alone, in order that he may be honored according to his dignity. Therefore, immediately afterwards, contrary to grammatical usage, he used the same verb in the first person as a substantive, annexing it to a verb in the third person; that our minds may be filled with admiration as often as his incomprehensible essence is mentioned. But although philosophers discourse in grand terms of this eternity, and Plato constantly affirms that God is peculiarly τὸ ὄν (the Being); yet they do not wisely and properly apply this title, viz., that this one and only Being of God absorbs all imaginable essences; and that, thence, at the same time, the chief power and government of all things belong to him. For from whence come the multitude of false gods, but from impiously tearing the divided Deity into pieces by foolish imaginations? Wherefore, in order rightly to apprehend the one God, we must first know, that all things in heaven and earth derive Precario. — Lat. De grace. — Fr. at His will their essence, or subsistence from One, who only truly is. From this Being all power is derived; because, if God sustains all things by his excellency, he governs them also at his will. And how would it have profited Moses to gaze upon the secret essence of God, as if it were shut up in heaven, unless, being assured of his omnipotence, he had obtained from thence the buckler of his confidence? Therefore God teaches him that He alone is worthy of the most holy name, which is profaned when improperly transferred to others; and then sets forth his inestimable excellency, that Moses may have no doubt of overcoming all things under his guidance. We will consider in the sixth chapter the name of Jehovah, of which this is the root.

Exodus 3:15-17

15. And God said moreover unto Moses, Thus shalt thou say unto the children of Israel, The Lord God of your fathers, the God of Abraham, the God of Isaac, and the God of Jacob, hath sent me unto you: this is my name for ever, and this is my memorial unto all generations.

15. Et dixit rursum Deus ad Mosen, Sic dices filiis Israel, Jehova Deus patrum vestrorum, Deus Abrahae, Deus Isaac, et Deus Jacob, misit me ad vos. Hoc est nomen meum in perpetuum, et memoriale meum in seculum et seculum.

16. Vade et congrega seniores Israel, et dices illis, Jehova Deus patrum vestrorum apparuit mihi, Deus Abrahae, Isaac, et Jacob, dicendo, Recordando recordatus sum vestri, et quid vobis factum fuerit in Aegypto.

16. Go, and gather the elders of Israel together, and say unto them, The Lord God of your fathers, the God of Abraham, of Isaac, and of Jacob, appeared unto me, saying, I have surely visited you, and seen that which is done to you in Egypt:

17. Propterea dixi, Educam vos ex afflictione Aegypti ad terrain Chananaei, et Hitthaei, et Amorrhaei, et Pheresaei, et Hivaei, et Jebusaei, ad terram fluentem lacte et melle.

17. And I have said, I will bring you up out of the affliction of Egypt unto the land of the Canaanites, and the Hittites, and the Amorites, and the Perizzites, and the Hivites, and the Jebusites, unto a land flowing with milk and honey.