All this work of sanctification is done in what we designate the school of Christ; and it is only those who are in this school by being in Christ Jesus that can be sanctified and ultimately be a part of that glorious mystical body, the heavenly kingdom class that will constitute the great prophet, priest, and king.
This mystery hid from ages and generations and made known only to the saints is, says the apostle Paul, the Christ; and the Christ in you is the hope of glory. Those who are in Christ and who have the spirit of Christ in them have the glorious hope of being born on the divine plane as members of the body of Christ. These are called to the obtaining of the glory of our Lord Jesus Christ; and to them are given all the exceeding great and precious promises contained in the Word of God. The Prophet speaking of them and to them said: “The nations shall see thy righteousness, and all the kings thy glory: and thou shalt be called by a new name, which the mouth of the Lord shall name. Thou shalt also be a crown of glory in the hand of the Lord, and a royal diadem in the hand of thy God.” (Isaiah 62:2,3) These have the promise: “When Christ, who is our life, shall appear, then shall ye also appear with him in glory”. (Colossians 3:4) And “then shall the righteous shine forth as the sun in the kingdom of their Father".—Matthew 13:43.
The apostle Paul declares that he was made a minister, according to the gift of God, that he should preach to the nations the unsearchable riches of Christ, “and to make all see what is the fellowship of the mystery, which from the beginning of the world hath been hid in God, who created all things by Jesus Christ: to the intent that now unto the principalities and powers in heavenly places might be [made] known by the church the manifold wisdom of God, according to the eternal purpose which he purposed in Christ Jesus our Lord”. (Ephesians 3:7-11) Thus we see that this great mystery is the Christ, and that for six thousand years Jehovah has been preparing for, developing and completing this great mystery; and that when completed, he will use the Christ as his prophet, priest, and king to minister unto the people, to rule over the people, and to bless the people, according to his promise.
The Apostle declares that the whole creation is groaning and travailing in pain, waiting for the manifestation of this great mystery. (Romans 8:19-22) The people do not know for what they are waiting. But when the great mystery is complete and Messiah’s kingdom set up, then God will bring his long-promised blessings to mankind, and ultimately his will shall be done upon earth as it is done in heaven.
What is a mystery? ¶ 298.
How could Jehovah hide or keep secret his plan from others? ¶ 298.
Has he kept his plan secret? ¶ 298.
When Jesus was on earth, why did he teach by parables? ¶ 299.
Did the disciples always understand his meaning? ¶ 299.