William Burkitt on Luke 16:13

Observe here, a twofold master spoken of, God and the world. God is our Master by creation, preservation, and redemption; he has appointed us our work, and secured us our wages; the world is become our master by intrusion, usurpation, and a general estimation; too many esteeming it as their chief good, and delighting in it as their chief joy.

Observe, 2. That no man can serve these two masters, who are of contrary interests, and issue out contrary commands. When two masters are subordinate, and in their commands subservient to each other, the difficulty of serving both is not great; but where commands interfere, and interests clash, it is impossible: no man can serve God and the world, but he may serve God with the world; we may be served of riches, and yet serve God; but we cannot serve riches, but we must disserve God; we cannot serve God and the world both, and seek them as our chief good and ultimate end, because no man can divide his heart between God and the world.

Learn hence, that to love the world as our chief good, to seek it as our highest interest, and to serve it as our chief commander, cannot stand with the love and service which we bear and owe to God our Maker. The world's slaves, while such, can be none of God's freemen.