It’s interesting to me that Abraham and Sarah both laughed at the initial presentation of the promise that they would have a child in their old age, but Abraham was also so faithful that he chose a time to circumcise every male in his household. That must have taken a lot of courage and faithful obedience. He not only had faith, but he was obedient, and God rewarded him, as promised. I wonder, would I be so faithful? Would I obey so deeply?