I hear many people talk about God having a plan for our lives. I hear others speak of God having a plan of salvation. The nature of the word "plan" subtly destroys the sovereignty of God and the helplessness of man. God does not "plan" anything. The sovereign God PURPOSES everything.
A plan (like a blueprint) is something that someone else can carry out and put into being. Salvation is not God’s plan that man must make effectual by his obedience. Salvation is what God purposed to do for His people by the obedience and sacrifice of His Son and what Christ the Savior has fully accomplished for His people. “The LORD of hosts hath sworn, saying, Surely as I have thought, so shall it come to pass; and as I have purposed, so shall it stand” (Isaiah 14:24).
A plan also may or may not come to pass. I have planned to do many things that I did not do (Romans 1:13). Salvation is not God’s plan. Salvation is the purpose of God for His people. A purpose which God SHALL bring to pass. “In whom also we have obtained an inheritance, being predestinated according to the purpose of him who worketh all things after the counsel of his own will” (Ephesians 1:11). “For the Lord of hosts hath purposed, and who shall disannul it? and his hand is stretched out, and who shall turn it back” (Isaiah 14:27)?