Morover, the world wide revival of the Gospel of the Kingdom before the End is certain (Matthew 24:14)
Already considerable attention is being concentrated, even in sceptical quarters, on our Lord's apocalyptic utterances.  The Kingdom in it's fulness is yet to come.  It is always to be prayed for.  It is the great end which is ever before us. 
"FOR FLESH AND BLOOD CANNOT INHERIT THE KINGDOM OF GOD, NEITHER DOTH CORRUPTION INHERIT INCORRUPTION.  BEHOLD, I TELL YOU A MYSTERY: WE SHALL NOT ALL SLEEP, BUT WE SHALL ALL BE CHANGED" (1 Cor. 15:50)

Thus it is natural that the question should now be pressed - is the Millennial Age itself in the nature of a reward?Is the possession of some one of the crowns a title to entrance into the Kingdom? Can a disciple be excluded and yet his name be found at last written in the Lamb's Book of life? (Rev. 20:15)
The scriptures alone can supply the answer.  Nor is there anything alarming in the suggestion.  All are agreed that rank in the Kingdom is regulated by service and suffering:
if entry itself, or exclusion, also turns on service and suffering, it is plainly only an extension of a momentous principle already accepted and taught. 

But before turning to the Word of God it may be well to observe that many godly servants of Christ have understood the Scriptures to teach the possibility of a believer's exclusion. 

Polycarp, an actual disciple of the Apostle John says: "If we please Him in this present Age, we shall also receive the Age to come; and if we walk worthy of Him, we shall also reign together with Him."  (Polycarp)

"The opinion that the Millennial Reign was even confined to the martyrs prevailed, as is known, to a great extent in the early Church, and not only proved a support under martyrdom, but rendered many ambitious of that distinction.  For the First Resurrection is limited to a portion of the redeemed Church; and while eternal life and the inheritance are of faith and free grace, and common to all believers merely as such, the millennial crown and the first resurrection are a Reward - the reward of suffering for and with Christ;  A special glory and a special hope, designed to comfort and support believers under persecution: a need and use which I have little doubt the Church will before long be called on to experience collectively, as even now, and at all times, it has been experienced by some of its members. " (Burgh)

"Has any child of God any warrant of Scripture to expect that he will reign with the Lord during the period of Rev. 20?  But on the contrary, has not every perfect and final state? 
(Robert Chapman)

"Into that glorious company of the First Resurrection it is probable that only those who have been partakers of Christ's humiliation and suffering (either personally or throughout the present aeon) shall be received - a select portion of the redeemed, including the martyrs.
(Dr. E. R. Craven, editor of Lange's Apocalypse).

"To those who believe on Him, but go no further, the Lord does, indeed, give eternal life; but the fruition of it will not begin until the Last Day, until the thousand years of the Millennial reign are ended. Such persons will not therefor be permitted to enter the Kingdom of the Heavens" (G.H. Pember).

"The greatest of all the revelations about the future condition of the saints is, that they are to be identified with Jesus Christ in His reign -  that is, those who 'overcome.'  Not all saints are to be elevated to this position; this is for victorious saints".  (Dr. A.T. Pierson). 

"The gift of Eternal Life contains potentially the Prize; but that potentiality may never be developed in the present period of the believer's probation; and if such be the case he will miss the Kingdom and its glory in the coming Age".  (S.S. Craig)

These have been but a few recorded quotes made by godly servants, Christians who understood the scriptures for what they clearly show. 
 
 

Christian Responsibility | The Millennial Kingdom | 
Exclusion from the Holy Land
The First Resurrection | The Two Justifications | The Prize of Our Calling