Posted by Clyde Herrin
God is omnipotent. That means he has the power to do whatever he wants. But the Bible tells us there is one thing he can’t do which you or I or any other human can do easily.
So when God desired to show more convincingly to the heirs of the promise the unchangeable character of his purpose, he guaranteed it with an oath,so that by two unchangeable things, in which it is impossible for God to lie, we who have fled for refuge might have strong encouragement to hold fast to the hope set before us. (Hebrews 6:17,18)