In numerous passages throughout the Bible, there are places where Scripture speaks of God’s “purpose” (Acts 4:28), His “plan” (Ps 33:11; Acts 2:23), His “counsel” (Eph 1:11), “good pleasure” (Isa 46:10), or “will” (Eph 1:5). In one way or another, each of these designations refer to what theologians call God’s decree. The Westminster Confession famously characterizes describes God’s decree as follows: “God from all eternity, did, by the most wise and holy counsel of His own will, freely, and unchangeably ordain whatsoever comes to pass.”
So in those instances where Scripture speaks of God’s purpose, plan, counsel, pleasure, or will, these passages are referring to the divine decree by which God, before the creation of time, determined to bring about all things that were to happen in time. John Piper, summarizing God’s decree, says, “He has designed from all eternity, and is infallibly forming, with every event, a magnificent mosaic of redemptive history” (Desiring God, 40). This helpful summary presents three characteristics of God’s decree that succinctly encapsulate the teaching of Scripture: God’s decree is eternal, immutable, and exhaustive.