God is complete in what He has done. There is nothing to be added to. Not a thing at all.
Nothing can be taken away from it. Everything God has doe will endure forever.
God is God. God’s work is complete.
“I know that everything God does will endure forever; nothing can be added to it and nothing taken from it.” ~King Solomon Ecclesiastes 3:14
Anticipating that people who cannot understand God’s plan might accuse Him of being arbitrary, Solomon described the nature of God’s plan and the response it should elicit. Solomon said the work of God is eternal (everything God does will endure forever) and perfect and immutable (nothing can be added to it and nothing taken from it). In support of this last point Solomon referred as he did to the repetition of natural events: Whatever is has already been, and what will be has been before.
He added that this is part of God’s deliberate plan. God will call the past to account may also be rendered “God calls back the past” (niv marg.) or “God seeks what has passed by” (nasb). Some commentators suggest the paraphrase, “God seeks to repeat what has passed.”
Franz Delitzsch summarizes the thought of this statement: “The government of God … does not change; His creative as well as His moral ordering of the world produces with the same laws the same phenomena. His government remains always, and brings … up again that which hath been” (“Ecclesiastes” in Commentary on the Old Testament in Ten Volumes, 6:264).
The response God wants people to have to His immutable, inscrutable plan is one of fear, reverence, and humble submission. Why? So men will revere Him.