John 16:4 "But these things I have told you, that when the time comes, you may remember that I told you of them. And these things I did not say to you at the beginning, because I was with you."
Our Lord kept mentioning that the reason He had told His disciples those things beforehand was that when those things come to pass they will remember that He had told them before, then they will believe.
John 14:29 “And now I have told you before it comes, that when it does come to pass, you may believe."
Faith of the Israelites
From the OT, the Israelites saw the numerous miracles of how Yahweh delivered them from Pharaoh, the parting of the Red Sea, etc., but when they saw the giants and high walls in Canaan Land, they rebelled against Moses and God.
Deu 11:18-19 "Therefore you shall lay up these words of mine in your heart and in your soul, and bind them as a sign on your hand, and they shall be as frontlets between your eyes. You shall teach them to your children, speaking of them when you sit in your house, when you walk by the way, when you lie down, and when you rise up."
But the new generation that were raised up in the wilderness were taught and filled with the words of God and by faith, fearlessness they entered and possessed the Promised Land.
Our Faith in the Great Tribulation
Many godly pastors will be crucified (gospel preached to all via TV and internet) by the authorities under the New World Order. These will frighten unlearned Christians to apostate. Our Lord told us to prepare them so that before they face any persecution, they must be ready and have complete faith in His words. So when they can rejoice seeing Jesus' end time signs being fulfilled one by one, then they are ready to face the great Tribulation.
The next Sign - World War 3?
Mat 24:6 "And you will hear of wars and rumors of wars. See that you are not troubled; for all these things must come to pass, but the end is not yet."
I believe that the next sign to be fulfilled will be World War 3, which will be so intense, extensive, deadly with over a billion killed (as though it is the end of the world). This will correspond to the 4th Seal with a fourth of all mankind killed.
Judgement to begin in His house
1Pet 4:17 For the time has come for judgment to begin at the house of God; and if it begins with us first, what will be the end of those who do not obey the gospel of God?
Before the 1st advent of Jesus, John the Baptist was sent to prepare the Jews to repent of the sins otherwise they will not be able to accept the true light. Similarly, before Rapture, the Holy Spirit by His words will convict us to repent of worldliness, covetousness, heresies, etc. otherwise God will not protect us in WW3. I believe that all depraved pastors, leaders, false christs, hypocrites and those unfaithful stewards hoarding/stealing His money will all be killed during WW3 and as tares cast into Hades. Then being free of heresies, we will be able to walk in truth and overcome the great Tribulation with joy.
Tit 2:11-13 For the grace of God that brings salvation has appeared to all men, teaching us that, denying ungodliness and worldly lusts, we should live soberly, righteously, and godly in the present age, looking for the blessed hope and glorious appearing of our great God and Savior Jesus Christ,
Brethren, for what profit is it to a man if he gains the whole world, and loses his own soul? Or what will a man give in exchange for his soul? (Mat 16:26)