"Where is your wife Sarah?" they asked him.
"There in the tent," he said.
Then the LORD said, "I will surely return to you about this time next year, and Sarah your wife will have a son."
Now Sarah was listening at the entrance to the tent, which was in behind him. Abraham and Sarah were already old and well advanced in years, and Sarah was past the age of childbearing. So Sarah laughed to herself as she thought, "After I am worn out and my master is old, will I now have this pleasure?"
Not only had Abraham and Sarah been waiting for years to have their own child which God had promised to them, she was now incapable of having children. They had Ishmael but he was not the son that God had promised.
So the question seems to be, "How long do we wait for God to fulfill His promise?"
We really aren't very different from Abraham and Sarah when it comes to waiting on the LORD. We tend to like to "help" God along so that His promise is fulfilled sooner rather than later. However, when we do this, we aren't really showing that we trust God to take care of us.
It doesn't mean for us to sit back and do nothing. We are to continue to serve God and to share His love with others but we need to remember to wait on God's timing not on our timing.
This takes an incredible amount of patience. It means that we have to let go of our control over our lives and over the lives of others. It means that we need to surrender ourselves completely to God's will.
This isn't easy today in our world of "get what you want right now." It was just as difficult during the times of Abraham and Sarah.
In these verses from Genesis 18 we again see a demonstration of God's grace. It wasn't Abraham and Sarah. it was God blessing them. Sarah could no longer have children. Their son was a miracle from God.
Ishmael was about 13 years old when Isaac was born. Abraham was 100 and Sarah was 90.
Are we willing to wait just as long?