Jamieson, Fausset and Brown on Revelation 22:10

10. Seal not--But in Da 12:4, 9 (compare Da 8:26), the command is, "Seal the book," for the vision shall be "for many days." The fulfilment of Daniel's prophecy was distant, that of John's prophecy is near. The New Testament is the time of the end and fulfilment. The Gentile Church, for which John wrote his Revelation, needs more to be impressed with the shortness of the period, as it is inclined, owing to its Gentile origin, to conform to the world and forget the coming of the Lord. The Revelation points, on the one hand, to Christ's coming as distant, for it shows the succession of the seven seals, trumpets, and vials; on the other hand, it proclaims, "Behold, I come quickly." So Christ marked many events as about to intervene before His coming, and yet He also says "Behold, I come quickly," because our right attitude is that of continual prayerful watching for His coming (Mt 25:6, 13, 19; Mr 13:32-37 [Auberlen]; compare Re 1:3).