Whatever your hand finds to do, do with your might; for there is no work or thought or knowledge or wisdom in Sheol, to which you are going.
Therefore, my beloved, be steadfast, immovable, always excelling in the work of the Lord, because you know that in the Lord your labor is not in vain.
There’s a huge contrast between Qoheleth’s down in the mouth, dire outlook on life and Paul’s take in light of the gospel of Christ and specifically the resurrection of Christ. Qoheleth basically tells his (or hers, but likely his) audience to give it all they’ve got, because this life is it. Work ends here, so you might as well give it your all, along with fully enjoying the simple gifts God gives, even though really “all is vanity.” Paul makes the point in the quoted passage from his first letter to the Corinthian church that if this life was the end, then what he and others with him were doing would make no sense at all.
If for this life only we have hoped in Christ, we are of all people most to be pitied.
But in fact Christ has been raised from the dead, the first fruits of those who have died.
If I fought with wild animals at Ephesus with a merely human perspective, what would I have gained by it? If the dead are not raised,
“Let us eat and drink,
for tomorrow we die.”
Paul is telling us that all we do now matters both for this life and beyond. It’s the work of the Lord, and what Paul was referring to was specifically the work he and others with him were engaged in: the service of the gospel in sharing the good news of Christ and seeing churches planted. And what a sacred work that is! But all of our work as unto the Lord, all of our works are actually sacred, no matter how mundane it may seem.
That sadly enough doesn’t mean that every job out there is good, or sacred in and of itself. We may want to find work that provides legitimate services to people, even if such services would be of no interest or use to us. Most or at least a lot of work fits in that category. We’re especially blessed if we do work which provides something needed for this life, and perhaps for the next as well.
Not only our actual work, but how we do it is of sacred importance to God. Are we doing it more and more out of the yoke of Christ (Matthew 11:28-30)? Are we seeking to do all out of love for God and for others? Are we seeking in everything to be pleasing to the Lord?
We need to roll up our sleeves, and set ourselves to fulfill whatever tasks we have, what is set before us. Letting our light shine in that way, that others may see our good works and glorify God (Matthew 5:16). In and through Jesus.