To find them ready to receive Him at any hour of day or night, when one might least of all expect Him, is peculiarly blessed. A servant may be truly faithful, even though taken so far unawares that he has not everything in such order and readiness for his master's return as he thinks is due to him, and both could and would have had if he had had notice of the time of his coming, and so may not be willing to open to him "immediately," but fly to preparation, and let his master knock again ere he admit him, and even then not with full joy. A too common case this with Christians. But if the servant have himself and all under his charge in such a state that at any hour when his master knocks, he can open to him "immediately," and hail his "return" that is the most enviable, "blessed" servant of all.
- Jamieson-Fausset-Brown Bible Commentary
