(Desiring God Ministries: Tyler Kenney)
In essence, what the doctrine states is that there are... well... two wills in God. The first will is his will of command (or as Edwards says below, "law"). This is expressed through God's revealed desires for people, desires such as "Thou shalt not kill," or "You shall love your neighbor as yourself."
The second will is his will of decree, which is the will by which God brings to pass all that actually happens, whether it accords with his will of command or not. This is also known as his secret will, since what God intends to do in any one event is unknowable to us, except for what he reveals through prophecy.
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