Why do we read this prophecy when the time is still so far off?

He answers, “I am coming quickly! Blessed is he who keeps the words of the prophecy of this book” (Rev. 22:7). He warns us not to waste time doubting, but through faith to accept the prophecy and keep its words, that is, its commandments. We are vigilant, awaiting His coming. Therefore, in the First Service of the Midnight Prayer we pray: “Behold the Bridegroom is coming at midnight, blessed is the servant whom He finds watching. But he whom He finds sleeping is unworthy of going with Him. Therefore, take heed, O my soul that you may not fall into deep sleep, and then be cast out of the kingdom. But watch and cry out saying, ‘Holy, Holy, Holy are You, O God, for the sake of the Theotokos, have mercy on us’ … But watch entreating that you may meet Christ the Lord with rich oil, and He may grant you the wedding of His true and heavenly glory.”