1 John 2:18
18Little children, these are the end times, and as you heard that the Antichrist is coming, even now many antichrists have arisen. By this we know that it is the final hour.
Children, these are the end times; antichrist was heard of, and many antichrists have come. Wesley: the last dispensation of grace, to continue to the end of time. Under antichrist he includes all false teachers and enemies to the truth, whatever doctrines or men are contrary to Christ. Antichristianism has been spreading from his time.
The age of the gospel is already the last; vigilance is the mood, not date-setting. Many antichrists already: the danger is present teachers, not only a future figure.
Calvin: many sects had risen. He fortifies the faithful and turns the offense to a contrary purpose: the last time has come, therefore greater vigilance. Antichrist was a thing well known; they had been warned from the beginning. There were already many antichrists as forerunners; properly Antichrist was not yet, but the mystery of iniquity was working.
So many ages since John do not prove the prophecy false; nothing more remained but that Christ should appear. No time is fixed. Watch, because the signs are already in the churches.