The Apostle Paul
Ephesians 6:7BSB·traditional attribution

Serve with good will, as to the Lord and not to men,

John Calvin Reformed @genevareformer

With good will doing service. (Ver. 7.) This is contrasted with the suppressed indignation which swells the bosom of slaves. Though they dare not openly break out or give signs of obstinacy, their dislike of the authority exercised over them is so strong, that it is with the greatest unwillingness and reluctance that they obey their masters.

Matthew Henry Presbyterian @wholebiblehenry

Here we have further directions concerning relative duties, in which the apostle is very particular. I. The duty of children to their parents. Come, you children, hearken to me, I will teach you the fear of the Lord. The great duty of children is to obey their parents (Eph 6:1), parents being the instruments of their being, God and nature having given them an authority...

Commenting on Ephesians 6:1-9

John Gill Reformed Baptist @doctorgill

With good will doing service,.... To their masters; not grudgingly, with an ill will; no otherwise, nor longer than when they are forced to it; but of a ready mind, and with a cheerful spirit, taking delight in their work, and reckoning it a pleasure to serve their masters; as an Israelite that is not sold, who does his work "with his good will", and...