In hope he believed against hope, that he should become the father of many nations, as he had been told, “So shall your offspring be.” He did not weaken in faith when he considered his own body, which was as good as dead (since he was about a hundred years old), or when he considered the barrenness of Sarah’s womb. No unbelief made him waver concerning the promise of God, but he grew strong in his faith as he gave glory to God, fully convinced that God was able to do what he had promised.
25 years is a long time to wait, especially when you are already old and God promises you and your wife you will have a baby. Paul said after this period of time, Abraham hoped against hope and trusted God that He will deliver on His promise.
If you have been through great loss and sadness, it is hard to hope for good again, but we can learn to hope again just like Abraham and Sarah did. It takes time. But we are reminded that we walk through the valley of the shadow of death, we do not stay there (Psalm 23). Take time to look at the Psalms to see the goodness of God and His wonderful works for you (Psalm 103). Remind yourself of passages in the Bible that give hope (Romans 15:4), like the story of Abraham and Sarah. Cry out to God in your pain, and He will in time heal your broken heart (Psalm 147:3). Surround yourself with encouraging people who will lift you up in your pain. I had a friend, Benjamin, who gave me an assignment to take a mason jar and fill it with accomplishments, positive things, and what God has done for me. It was an encouraging and hope-building exercise to see all the great things God has done. The jar is full. Your jar is full too. You can hope again.
Proverbs 13:12 – Hope deferred makes the heart sick, but a desire fulfilled is a tree of life.