Maybe you've thought as I did that it was Sarah who first laughed and who therefore triggered the naming of Isaac (his name means, he laughs). Funny thing (pun intended!). I had it wrong. Abraham laughs first. So did Abraham. Sarah will have her time later, and will be called on it. God's word will be accomplished. What he says happens. From, "Let there be light," to "You will have a son," when God speaks, things happen.
