Not slothful in business; fervent in spirit; serving the Lord;
Read Chapter 12
Ambrosiaster
AD 400
This means that we should not be lukewarm in doing God’s work or the law, as God says in the Revelation of John: “Because you are lukewarm, I shall spit you out of my mouth.” Daily meditation removes laziness and makes people vigilant. Commentary on Paul’s Epistles.
Love by itself is not enough; there must be zeal as well. For zeal also comes out of loving and gives it warmth, so that the one confirms the other. For there are many who have love in their mind but who do not stretch out their hand. This is why Paul calls on every means he knows to build up love.