In Genesis 18, God visits Abraham and Sarah and lets them know this time next year, they will have a son. Sarah hears and laughs because they are in their 90's. God asks why she laughed and she denies it instead of just being honest with God who always knows the truth, even when we try to hide or deny things. God asks "Is anything too hard for the Lord?" No, nothing is too hard for the Lord. Abraham intercedes for Sodom as God reveals His plans for the city. He needs Abraham to understand God's ways of balancing righteousness, mercy, and Justice.
