1 Except the Lord build the house, they labour in vain that build it: except the Lord keep the city, the watchman waketh but in vain.

2 It is vain for you to rise up early, to sit up late, to eat the bread of sorrows: for so he giveth his beloved sleep.

3 Lo, children are an heritage of the Lord: and the fruit of the womb is his reward.

4 As arrows are in the hand of a mighty man; so are children of the youth.

5 Happy is the man that hath his quiver full of them: they shall not be ashamed, but they shall speak with the enemies in the gate.

If we will walk in the light God has given us, then we shall be blessed. David is speaking of our home, our family. If we rear our children to  love the Lord our God, then we shall be happy. We inherit what we created. If our house was dedicated to God, then we will be blessed in our old age as the children are no longer children but protectors of the home.

"Except the Lord build the house, they labour in vain that build it: except the Lord keep the city, the watchman waketh but in vain. As arrows are in the hand of a mighty man; so are children of the youth. Happy is the man that hath his quiver full of them: they shall not be ashamed, but they shall speak with the enemies in the gate." Ps. 127:1,4,5.