God’s decretive will is sometimes described as the sovereign, efficacious will by which God brings to pass whatever He pleases by His divine decree. An example of this may be seen in God’s work of creation. When God said, “Let there be light” (Gen. 1:3), He issued a divine imperative. He exercised His sovereign, efficacious will. When He did so, it was impossible for the light not to appear. It appeared by the sheer necessity of consequence.
The decretive will can have no other effect, no other consequence than what God sovereignly commands. He did not request the light to shine. Neither did He coax, cajole, or woo it into existence. It was a matter of absolute authority and power.
No creature enjoys this power of will. No man’s will is that efficacious. Men issue decrees and then hope they will bring about their desired effects. God alone can decree with the necessity of consequence.
Read Genesis 1, observing how God repeatedly exercised His sovereign, efficacious will in creation.