Blessed is that servant, whom his lord when he cometh shall find so doing.
Blessed (happy and to be envied) is that servant whom his master finds so doing when he arrives.
Happy are the servants whom the master finds fulfilling their responsibilities when he comes.
Blessed is that servant if, when his Lord will return, he will find him acting in this manner.
Blessed is that servant, whom when his lord shall come, he shall find so doing.