Isaiah 48:18Meaning & Commentary from the Church Fathers

Thus, He asserts, “Thus saith the Lord, who hath delivered thee, O holy one of Israel: I am thy God.” However, one might wonder, as a descendant of Israel could express, “You have rescued and saved us from fire and punishment, from burdens and bondage, and from the hands of our foes, demonstrating Your omnipotence. By a mere command, You achieve all that You desire; yet how is it that we, who have always taken pride in Your protection and love, face such disaster, falling under the power of our enemies, becoming slaves unexpectedly when we were born free?" What is God's response to this? “I will instruct you,” He says, “to create a path for you to follow. I have laid down a law for you that prescribes what is right, guiding you toward what pleases Me, revealing the way to truth, teaching you holiness, and steering you toward the straight path. If you had chosen to pursue it, you would have become a faithful servant, adorned with the beauty of virtue. However, you strayed from the straight way, deviated from the true path, and turned to what contradicts the law. You have served the host of heaven, offered sacrifices to idols, worshipped non-deities, forgotten your Creator, and disregarded His law. Had you followed My commandments, your peace would have flowed like a river, and your righteousness like the waves of the sea. Yet, He seeks to illustrate a point. When the most intense rain falls upon the mountains, the torrents rush down with immense and unstoppable force, so that nothing can withstand their speed. This imagery is unmistakable. The crashes of the sea waves are fearsome, not only to sailors and heavily laden ships but even to the rocks, which can fracture under the force of the water. Thus, He states, if you had been faithful to My words, and your mind had remained submissive, then your peace would have been like the river and the waters, invulnerable to enemies or those wishing to attack you. Alternatively, one might explain this by illustrating the abundance of the world’s stability, likening it to a river that flows perpetually and swiftly and waves that are ever rising and crashing on the shore. “And the seed of thy seed shall be as sand, the offspring of thy womb as the feathers of the earth,” indicating, “If none drew arms and no enemy hand caused destruction, you would have been fruitful and countless, with your children resembling grains of sand and dust. Yet, due to your arrogant defiance of God, by pursuing all that is base and contemptible, you have greatly diminished and do not experience increase in numbers. Despite this, you are presently consumed; yet a remnant of Israel remains safeguarded. God has declared that it will never be entirely eradicated, honoring the promise made to the patriarchs. He then commands, ‘Depart from Babylon and flee from the Chaldeans.’ This is a royal decree, liberating Israel from captivity. Just as earthly rulers and sovereigns grant respite to those who toil under them with love and kindness, so too does the God of all humanity issue a tender command to those burdened by bondage, saying clearly, “Depart,” that they may know the Redeemer and the source of all joy.

The Lord, having promised a future to Israel, provides the reasons for previous discipline, which, should they avoid repeating their errors, will spare them from similar consequences. He calls out, if you would heed my commandments, as suggested in the Septuagint, or perhaps expressing a yearning: Oh, if only you would listen to my laws, for fulfilling them would bring you peace like a river and righteousness like vast, unexplored depths—this demonstrates abundance in every aspect of life.

The statement about your offspring being as numerous as the sand and the children of your womb as the pebbles seems to resonate among the Jewish people today, who continue to bear children and grandchildren abundantly; yet, how can this promise be understood in this light when they experience little peace or righteousness?

If He is angry with them, how is their progeny increasing daily? If He has been appeased, why then are they in bondage and lacking peace and righteousness? This indicates that the discussion pertains to the apostolic lineage, as noted earlier: had the Lord not preserved a remnant, we would have become like Sodom (Isaiah 1:9). What was unfulfilled at that moment will find its completion with the coming of Christ, and the lineage of Israel will stand before Him eternally.

The water from this well represents the grace of the Spirit, a stream flowing from the fountain of eternal life. The Holy Spirit is the wellspring of life. Observe how the unity of Divine majesty is underscored in His own words, and note how even unbelievers cannot deny the Source found in Christ. Additionally, God the Father compares the Holy Spirit to a river: "For thus saith the Lord, Behold, I direct the world unto him as a river, and the riches of the nations" (Is 66:12). Who can question that this river of life is the Son, from whom the streams of eternal life flow?