Ephesians 6:7

With good will doing service, as to the Lord, and not to men. — Here we ascend to a still higher quality than “singleness of heart.” To do service “with good will,” that is, gladly and cheerfully, “counting it joy to spend and to be spent” in the service, is really to serve, not as a slave, but as a freeman. Only so far as in the relation of slaves to masters there is, or has been, any shadow of the filial and parental relation, is this possible on merely human grounds. But St. Paul urges, in 1 Corinthians 7:22, that the slave “when called in the Lord, becomes the Lord’s freeman,” entering a “service which is perfect freedom.” That conception, logically worked out, has ultimately destroyed slavery. Meanwhile it gave to the slave in his slavery — lightened though not yet removed — the power of service “with good will, as to the Lord.”