The tribulation period is seven years, and when the signing of the covenant occurs, people who know the Bible and take it literally will know that, seven years later, Christ is going to come in His power and glory.
I know that some are always studying the meaning of the fourth toe of the right foot of some beast in prophecy and have never used either foot to go and bring men to Christ. I do not know who the 666 is in Revelation but I know the world is sick, sick, sick and the best way to speed the Lord's return is to win more souls for Him.
You will bear me witness, my friends, that it is exceedingly seldom I ever intrude into the mysteries of the future with regard either to the second advent, the millennial reign, or the first and second resurrection. As often as we come about it in our expositions, we do not turn aside from the point, but if guilty at all on this point, it is rather in being too silent than saying too much
Author: Charles Spurgeon Source: The First Resurrection, The Metropolitan Tabernacle Pulpit, 7:345.
All portions of Scripture ought to be approached with deep humility and earnest prayer for the teaching of the Spirit. On no point have good people so entirely disagreed as on the interpretation of prophecy; on no point have the prejudices of one group, the dogmatism of a second and the extravagance of a third done so much to rob the church of truths which God intended to be a blessing.
The visible is the ladder up to the invisible; the temporal is but the scaffolding of the eternal. And when the last immaterial souls have climbed through this material to God, the scaffolding shall be taken down, and the earth dissolved with fervent heat--not because it was base, but because its work is done.
The book of Revelation says that we no longer need the sun or the moon, for Christ is the light of the world.