John Chrysostom
When the disciples intended to ask the Lord something, they approached Him all together. They did this in order to incline Him to answer by their very number. They knew that His former words, "Of that day and hour no one knows" (Mt 24:36), were spoken by Him to turn the question away from Himself. This was not because of ignorance, but because He did not wish to answer. Therefore they approached Him again and asked. They would not have asked if they had truly been convinced of His ignorance. Since they had heard that they would receive the Holy Spirit, they wished to know the time, as men already worthy of it and ready to be delivered from their troubles. They did not want to cast themselves into dangers, but to enjoy rest. What had already happened to them was no small matter.
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On the contrary, they were in extreme danger. Therefore, saying nothing to Him about the Spirit, they ask: "Lord, will You at this time restore the kingdom to Israel?" They did not say, "When?" but, "At this time?" So much did they desire to know this day. For this reason they approach with great reverence. It seems to me that they did not yet understand quite clearly what this kingdom was, because they had not yet been taught by the Spirit. They did not say, "When will this be?" What did they say? "Lord, will You at this time restore the kingdom to Israel?" They spoke as though it had already been destroyed. They asked in this way because they were still attached to sensible things, though not to the same degree as before. They had not yet become better. Yet they already thought more highly of Christ. Since they had been raised up, He also speaks to them in a loftier way. He no longer says to them that even the Son does not know "of that day" (Mk 13:32). What does He say? "It is not for you to know times or seasons which the Father has put in His own authority" (Acts 1:7).