"'It is not for you to know times or seasons.' He has hidden that from us so that we might keep watch, and that each of us might think that this coming would take place during our life. for, if the time of his coming were to be revealed, his coming would be in vain, and it would not have been desired by the nations and the ages in which it was to take place. He has indeed said that he will come, but he did not define when, and thus all generations and ages thirst for Him."
St. Ephrem the Syrian, Commentary on Tatian's Diatessaron