In Romans 4 beginning at 13 the apostle Paul takes some time to describe the posture of Abraham as it related to the "promise" of being the father of many nations. In this portion of his writings, Paul contrast the law and the righteousness of faith in a way that helps us to understand that Abraham (who preceded the Law) attained the promise by faith and not by meeting the requirements of the law.
When Abraham was challenged by YHWH to believe that he and Sarah would bear a child, all of the natural circumstances were against that reality. However, the Bible emphasizes that "contrary to hope, he believed in hope" so that the very thing G-d said would happen did in fact happen.
Abraham was an example to us of how to hope when hope seems hopeless. "Contrary to hope" speaks of the natural circumstances that conflicted with the word of promise. "Believing in hope" represents the ability to hope because of what G-d said. When we hear a word from the Lord, it is incumbent upon us to immediately move into expectancy if we are going to receive the manifestation of the promise. When the natural seems hopeless, our only hope is that G-d said it and therefore He will perform it. The power to expect with this conviction is the only way to transcend natural circumstances and maintain the continuity of your faith.
At 100 years old (and Sarah 90 years old) Abraham had to consciously overcome the reality of the deadness of Sarah's womb. Remember, Abraham at this point is not struggling with the seed, he is struggling with the soil. He knows that he can produce based upon his experience with Hagar. The challenge now is with the womb of Sarah. This is exactly where the church (bride of Christ) is today. Jesus is fully confident about the seed that He is sowing in the church, the problem is with the soil that the seed is being deposited into. The body of Christ has to begin to look at it's soil and see why it is not capable of holding the seed?
The main reason why Sarah can't hold the seed is because she has stopped ovulating and until she begins to ovulate again, the womb is not capable of reproduction. So Abraham has to begin to speak the word of promise to Sarah. This "word" is real, physical and tangible in that it must produce expectation and thereby induce ovulation in Sarah if she is going to bear fruit.
So Abraham must repeat in the ear-gate of Sarah morning, noon, and night..."Sarah we are going to have a baby" until her inner-man receives it and begins to manifest belief with the sign of ovulation. As soon as Sarah feels her cycle has returned she knows immediately that she is capable of having a child; even before she gets pregnant.
You must expect and believe against all odds that the things that G-d has released into your spirit, your inner-man; your word of promise must and will come to pass in spite of the surrounding facts. Your expectation is powerful and life changing!
May this word of promise and expectation come alive in you to the point that you begin to move into a cycle that allows you to know that you can produce whatever G-d has promised you!