I recently did a small study on the word "Will". I found this worthy of sharing here on this old post.
The law defines the will of God, but the plan tells us His sovereign will, the heavenly perspective, the bigger picture. The will of God to Pharaoh was to "let My people go." The plan of God was to harden Pharaoh's heart (Ex. 7:3; 10:1) in order to DELAY the fulfillment of His will until ten plagues had judged Egypt. Yes, God always took credit for this. We can disagree with Scripture to our own detriment, but we will not change the facts as they are written.
The New Testament uses two different words that are translated "will." They are not the same, but because the translators did not understand their difference, they have obscured a vital truth in understanding the relationship between man's will and God's sovereignty.
Romans 9:19 You will say to me then, Why does He still find fault? For who resists His WILL [Greek: boulema, "plan, or higher intention"]
Romans 2:17, 18, which says,
17 But if you bear the name Jew, and rely upon the Law, and boast in God, 18 and know His WILL [Greek: thelema, "will"], and approve the things that are essential, being instructed out of the Law . . .