There is no reason for you to labor in vain. Many people, indeed, labor in vain. Do you know why? Read this:
“If the Lord does not build the house, the work of the builders is useless; if the Lord does not protect the city, it is useless for the sentries to stand guard. It is useless to work so hard for a living, getting up early and going to bed late. For the Lord provides for those he loves while they are asleep” (Psalm Psalm 127:1-2).
What is expected of us according to these two verses so that we will not labor in vain?