[This relates to the Sunday School lesson because God allows us to either give in to temptation and will discipline us, or accept His day-to-day grace and escape temptation, as He promised. God allows this choice, and yet is Sovereign.]
Consider, then, the following passage in which a messenger of the Lord delivers to David a message of discipline:
1 Chronicles 21:11-12
So Gad came to David and said to him, “Thus says the LORD: ‘Choose for yourself, either three years of famine, or three months to be defeated by your foes with the sword of your enemies overtaking you, or else for three days the sword of the LORD—the plague in the land, with the angel of the LORD destroying throughout all the territory of Israel.’”
In this, we see that God wants David to choose between three options. Yes, God, in his Sovereignty, WILLS that a person make a choice. God could choose for Himself. However, God is the boss, and if He wants a person to choose, then that person will be the one to choose. Why? Because God is in control, and He gets what He wants, according to the counsel of His will.
David gets a choice here. Does that make him in charge? Obviously not! If David was in charge, he wouldn't want to choose any of those punishments; he would choose peace, safety, and prosperity! As you can see, then, David is not in charge, even though he has a choice. God is in charge.