Are unprofitable servants - We have conferred no favor. We have "merited" nothing. We have not "benefited" God, or laid him under "obligation." If he rewards us, it will be matter of unmerited favor. This is true in relation to Christians in the following respects:

1. Our services are not "profitable" to God Job 22:2; he "needs" not our aid, and his essential happiness will not be increased by our efforts.

2. The grace to do his will comes from him only, and all the praise of that will be due to him.

3. All that we do is what is our "duty;" we cannot lay claim to having rendered any service that will "bind" him to show us favor; and,

4. Our best services are mingled with imperfections. We come short of his glory Romans 3:23; we do not serve him as sincerely, and cheerfully, and faithfully as we ought; we are far, very far from the example set us by the Saviour; and if we are saved and rewarded, it will be because God will be merciful to our unrighteousness, and will remember our iniquities no more, Hebrews 8:12.

Luke 17:10 Parallel Commentaries

Thankfulness for Mercies Received, a Necessary Duty
Numberless marks does man bear in his soul, that he is fallen and estranged from God; but nothing gives a greater proof thereof, than that backwardness, which every one finds within himself, to the duty of praise and thanksgiving. When God placed the first man in paradise, his soul no doubt was so filled with a sense of the riches of the divine love, that he was continually employing that breath of life, which the Almighty had not long before breathed into him, in blessing and magnifying that all-bountiful, …
George Whitefield—Selected Sermons of George Whitefield

Not with Outward Show
Some of the Pharisees had come to Jesus demanding "when the kingdom of God should come." More than three years had passed since John the Baptist gave the message that like a trumpet call had sounded through the land, "The kingdom of heaven is at hand." Matt. 3:2. And as yet these Pharisees saw no indication of the establishment of the kingdom. Many of those who rejected John, and at every step had opposed Jesus, were insinuating that His mission had failed. Jesus answered, "The kingdom of God cometh …
Ellen Gould White—The Desire of Ages

Journey to Jerusalem. Ten Lepers. Concerning the Kingdom.
(Borders of Samaria and Galilee.) ^C Luke XVII. 11-37. ^c 11 And it came to pass, as they were on their way to Jerusalem, that he was passing along the borders of Samaria and Galilee. [If our chronology is correct, Jesus passed northward from Ephraim about forty miles, crossing Samaria (here mentioned first), and coming to the border of Galilee. He then turned eastward along that border down the wady Bethshean which separates the two provinces, and crossed the Jordan into Peræa, where we soon …
J. W. McGarvey—The Four-Fold Gospel