Luke 12:37

“Blessed are those servants, whom the lord when he comes will find watching.”

Jesus then points out that those servants who are found ready and watching when the lord returns will be truly blessed. Not that they were doing anything special. It was one of the main duties of servants to be at readiness waiting for the return of their master. They would be blessed because in fulfilling their duty they were pleasing their lord. They were doing what it was their duty to do.

“Truly I say to you, that he will gird himself, and make them sit down to food, and will come and serve them.”

Indeed they will be so blessed that they will receive far more than they could ever have anticipated. It will become a special Servant's Day. The lord himself will tuck in his robes and sit them down at his table, and will himself come and serve them.

It is one of the quirks of human nature that through the ages important men have had ‘servants' days' when precisely this was done. For one short day (or part of a day) the servants were sat at table and the masters and their families served them. (They then made up for it over the remainder of the year). In this case it was to be a special day as a reward for their hard work and loyalty, and for their being ready. But this time it would be the Master Himself Who would serve them. Once again Jesus gets over the point that the greatest are those who serve. Men and women would expect Him to come in order to sit at the head of the table and lord it over all. But even in His glory, He would come as One Who had come to serve. Note that it is this act that definitely identifies Whom the lord of the house represents, the great Servant of the Lord.