His faith never quailed, even when he noted the utter impotence of his own body (for he was about a hundred years old) or the impotence of Sara's womb;

For when God said, I will come about this time and Sara shall have a son, that was a word of promise.

It was by faith that even Sara got strength to conceive, bearing a son when she was past the age for it ??because she considered she could rely on Him who gave the promise.

Thus Sara obeyed Abraham by calling him 'lord'. And you are daughters of Sara if you do what is right and yield to no panic.