Why Did Sarah Laugh on the Voice of Joy

In the Book of Genesis a historic testimony of the prophets of God and their family struggles in good times and bad times.  Learning to lean and depend on Jesus as a major source of strength.  God created families.  We live in fear of the impossible happening to us and Sarah in her old age laughed at what she rhought was impossible.  If God said it believe it and even if you do not believe it will come to pass.  The bible is the word of God.  My word shall not return unto me void.  Get ready for your miracle.