It is written by THE SPIRIT in Genesis chapter 18:
10 And He said, “I will certainly return to you according to the time of life, and behold, Sarah your wife shall have a son.”
(Sarah was listening in the tent door which was behind him.)
11 Now Abraham and Sarah were old, well advanced in age; and Sarah had passed the age of childbearing.
12 Therefore Sarah laughed within herself, saying, “After I have grown old, shall I have pleasure, my lord being old also?”
13 And the LORD said to Abraham, “Why did Sarah laugh, saying, ‘Shall I surely bear a child, since I am old?’
14 Is anything too hard for the LORD? At the appointed time I will return to you, according to the time of life, and Sarah shall have a son.”
15 But Sarah denied it, saying, “I did not laugh,” for she was afraid.
And He said, “No, but you did laugh!”
Sarah responded in fear to the promise given to Abraham and her. She was afraid she could not perform because of the current state of her body. She was old and well passed the age of bearing any children and she was moved by what her five physical senses were telling her. Isn’t that true for most people today? FATHER stated HIS Divine Intent to Abraham and Sarah heard HIS Word as well thus the seed of faith was planted in her in spite of her initial fear of failure. FATHER expected both of them to walk in faith going forward and ultimately Sarah’s fear was overcome by her faith in FATHER’S Word. Both Abraham and Sarah became unified in their faith in FATHER’S Word.
Paul wrote by THE SPIRIT in Romans chapter 4:
16 Therefore it is of faith that it might be according to grace, so that the promise might be sure to all the seed, not only to those who are of the law, but also to those who are of the faith of Abraham, who is the father of us all
17 (as it is written, “I have made you a father of many nations”) in the presence of Him whom he believed—God, who gives life to the dead and calls those things which do not exist as though they did;
The faith of Abraham and Sarah are such a clear examples of the power of great faith. Once they became unified in their faith, the manifestation of a son was simply a matter of time and neither would waver or allow unbelief to dilute their faith.
18 who, contrary to hope, in hope believed, so that he became the father of many nations, according to what was spoken, “So shall your descendants be.”
19 And not being weak in faith, he did not consider his own body, already dead (since he was about a hundred years old), and the deadness of Sarah’s womb.
Both Abraham and Sarah walked in great faith. Generally, the focus is on the Abraham but we see that Sarah walked in the same manner. FATHER would not override Sarah’s choice to accept or deny HIS Divine Intent thus we know she walked in unity with Abraham.
20 He did not waver at the promise of God through unbelief, but was strengthened in faith, giving glory to God,
21 and being fully convinced that what He had promised He was also able to perform.
22 And therefore “it was accounted to him for righteousness.”
Our circumstances are subject to change as well. Is anything too hard for the LORD? If HE can bring forth a dead womb to life in an elderly woman, HE can certainly succeed in resolving any issue or condition we may have. My body does not dictate reality but is designed to respond to FATHER’S Word and HIS Divine Intent of Love. Our mind must not be allowed to dilute our faith in HIS Word. We must not accept the knowledge spewed forth by the world’s understanding or lack thereof. Instead, let us stand on the infallible Word in whatever circumstance we face. Let us develop great faith as did Abraham and Sarah. Let us give glory to FATHER as HIS Word comes forth in victory over our situation!