“Blessed is that servant, whom his lord when he comes shall find so doing. Of a truth I say to you, that he will set him over all that he has.”
He now points out that the steward is a slave. He is not there to better himself but to serve. If the slave faithfully carries out his function he will be blessed. He will both prosper and be happy. For when his lord pays him a visit and discovers that he is looking after the feeding of the household well he will appoint him over everything. (We see here reminiscences of Joseph - Genesis 39:3-4). Note the change from steward to slave. It is being emphasised that he is but a humble slave and not dealing with his own things but the things of his master. He is a servant and not a lord (compare Luke 22:25-27) although as such he will be given great privilege (Luke 22:28).