When Abraham first learned of Jehovah’s purpose to bless Sarah with a child of her own, he “fell facedown and began to laugh.” (Genesis 17:17) He was amazed and overjoyed.

When one of the angels repeated to Abraham God’s promise about Sarah giving birth to a son, she was out of sight, within her tent, listening. The thought of giving birth at her age struck her as being so bizarre that she could not hold back​—she laughed to herself, saying: “After I am worn out and my lord is old, will I really have this pleasure?” The angel corrected Sarah with the pointed question, “Is anything too extraordinary for Jehovah?” Sarah’s reaction was fearful, defensive, and only too human. She blurted out: “I did not laugh!” The angel replied: “Yes! You did laugh.”​—Genesis 18:9-15.

Was Sarah’s laughter evidence that she lacked faith? Not at all. The Bible says: “By faith also Sarah received power to conceive offspring, even when she was past the age, since she considered Him faithful who made the promise.” (Hebrews 11:11) Sarah knew Jehovah; she knew that he could fulfill any promise that he made.