 Abraham said, Lord, what if I can only find 45 righteous people in Sodom? God said, all right, I'll spare Sodom if you can find 45 righteous people. Abraham went down to 40, and then 30, and then 20, and then all the way to 10. And even when Abraham had gotten it down to 10 righteous people, God said, yes, I'll spare Sodom if you can find 10 righteous people there.