God Had the Last Laugh
Genesis 21:1–7
After years of waiting, Genesis 21 opens with another glimpse into God’s faithfulness: “The LORD visited Sarah as he had said, and the LORD did unto Sarah as he had spoken” (Genesis 21:1). The cadence of this verse is deliberate, drawing our attention to the fact that God is both the ultimate Promise Maker and the ultimate Promise Keeper. It is another reminder that God’s Word and God’s works always correspond to one another.
This reality of God’s promise is finally experienced when “Sarah conceived, and bore Abraham a son in his old age, at the set time of which God had spoken to him” (Genesis 21:2). Notice that it was a “set time” on God’s timetable. Abraham’s age had not diminished God’s power, and Sarah conceived exactly when God intended. This “set time” reminds us that God is never hurried and never late. He is always right on time.
In Abraham’s quiet obedience we read: “And Abraham called the name of his son that was born unto him, whom Sarah bore to him, Isaac” (Genesis 21:3). He names the child exactly as God commanded—Isaac, Hebrew for “he will laugh” or “he will rejoice.” Here the tenderness of God comes into view. God does not erase Sarah’s laughter of disbelief from a year earlier; rather, He redeems it. The laughter that was once hidden, hesitant, and unbelieving is transformed into the joyful laughter of fulfilled promise. The very name of the child would forever testify that God had the final laugh. From that day forward, every time Sarah called for Isaac, she was reminded that God had turned sorrow into joy and unbelief into worship.
As the story unfolds, covenant obedience is seen when “Abraham circumcised his son Isaac being eight days old, as God had commanded him” (Genesis 21:4). Abraham does not merely rejoice in the promise fulfilled; he obeys the God who fulfilled it. The same God who gave the child also claimed the child, and Abraham responds in covenant obedience. In the quiet tenderness of a father holding his promised son, the faithfulness of the covenant remains central. Isaac is not merely loved—he is marked, set apart, and distinguished as belonging to the covenant people of God.
Then the weight of the years is added: “And Abraham was an hundred years old, when his son Isaac was born unto him” (Genesis 21:5). So many years had passed. So many miles had been traveled. No doubt there were people who laughed at Abraham and Sarah along the journey. Imagine hearing Abraham speak of becoming the father of many nations while he and Sarah remained childless decade after decade. Yet now the laughter had changed. Those who once chuckled in doubt could now laugh with Abraham and Sarah as they witnessed the goodness, power, and perfect timing of God.
Notice how Sarah herself interprets the entire scene: “God hath made me to laugh, so that all that hear will laugh with me” (Genesis 21:6). This is no longer the laughter of unbelief; this is the laughter of fulfilled promise. What once seemed impossible has now become a testimony of joy. Her laughter has been redeemed. What began in disbelief now ends in delight.
Then Sarah says, “Who would have said unto Abraham, that Sarah should have given children suck? for I have born him a son in his old age” (Genesis 21:7). This is more than amazement—it is worship. Sarah stands overwhelmed by the goodness and power of God.
And that remains the comfort for us today: God will always have the final word and the last laugh. Faith in Him may seem impossible in the present, and obedience to Him may even appear laughable to others. But God will fulfill what He has spoken, and His power will become unmistakably clear. Isaac’s very life and name became a testimony that God keeps His promises. It remains an example for us today to trust His Word, wait upon His timing, and allow Him to have the final laugh.