“So likewise ye, when ye shall have done all those things which are commanded you, say, We are unprofitable servants: we have done that which was our duty to do.”
King James Version (KJV)
17:10 When ye have done all, say, We are unprofitable servants - For a man cannot profit God. Happy is he who judges himself an unprofitable servant: miserable is he whom God pronounces such. But though we are unprofitable to him, our serving him is not unprofitable to us. For he is pleased to give by his grace a value to our good works, which in consequence of his promise entitles us to an eternal reward.
Lu 17:10 We are unprofitable servants. Our Master owes us no thanks when we serve him faithfully, for we have only done our duty. The heavenly reward to the faithful is of grace, not of debt (Ro 11:6).