God is sovereign. When I defined this for my kids I told them that God has the most power of anyone and can do anything He wants. They thought that was pretty great. We made gingerbread houses today and so we tied it into how God is sovereign over our house as well. Our verse is from 1 Chronicles 29.
11 Yours, LORD, is the greatness and the power
and the glory and the majesty and the splendor,
for everything in heaven and earth is yours.
Yours, LORD, is the kingdom;
you are exalted as head over all.
12 Wealth and honor come from you;
you are the ruler of all things.
In your hands are strength and power
to exalt and give strength to all.
13 Now, our God, we give you thanks,
and praise your glorious name.