“He is who He is, the same yesterday, today, and forever. This meaning is further explained in Exodus 3:15: YHWH—the God of your fathers, the God of Abraham, Isaac, and Jacob—sends Moses, and that is His name forever.

God does not simply call Himself “the One who is” and offer no explanation of His aseity, but states expressly what and how He is.

Then how and what will He be? That is not something one can say in a word or describe in an additional phrase, but “He will be what He will be.”

That sums up everything. This addition is still general and indefinite, but for that reason also rich and full of deep meaning.

He will be what He was for the patriarchs, what He is now and will remain: He will be everything to and for His people.

It is not a new and strange God who comes to them by Moses, but the God of the fathers, the Unchangeable One, the Faithful One, the eternally Self-consistent One, who never leaves or forsakes His people but always again seeks out and saves His own.

He is unchangeable in His grace, in His love, in His assistance, who will be what He is because He is always Himself.”

–Herman Bavinck, Reformed Dogmatics: God and Creation, Vol. 2 (Ed. John Bolt, and Trans. John Vriend; Grand Rapids, MI: Baker Academic, 2004), 2: 143.

“As living, thinking beings in time, we stand before the mystery of eternal uncreated being and marvel.

On the one hand, it is certain that God is the Eternal One: in Him there is neither past or future, neither becoming or change.

All that He is is eternal: His thought, His will, His decree.

Eternal in Him is the idea of the world that He thinks and utters in the Son; eternal in Him is also the decision to create the world; eternal in Him is the will that created the world in time; eternal is also the act of creating as an act of God, an action both internal and immanent.

For God did not become Creator, so that first for a long time He did not create and then afterward He did create.

Rather, He is the eternal Creator, and as Creator He was the Eternal One, and as the Eternal One He created. The creation therefore brought about no change in God; it did not emanate from Him and is no part of His being.

He is unchangeably the same eternal God.”

–Herman Bavinck, Reformed Dogmatics: God and Creation, Vol. 2 (Ed. John Bolt, and Trans. John Vriend; Grand Rapids, MI: Baker Academic, 2004), 429.