Psalms 127:1 - 5
ESV - 1 Unless the Lord builds the house, those who build it labor in vain. Unless the Lord watches over the city, the watchman stays awake in vain. 2 It is in vain that you rise up early and go late to rest, eating the bread of anxious toil; for he gives to his beloved sleep.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.