I John, your brother and fellow partaker in the tribulation and kingdom and endurance in Jesus, was on the island called Patmos because of the word of God and the testimony of Jesus (Revelation 1:9, Recovery Version)
[John] knew that the tribulation, kingdom, and endurance are three inseparable things. Before the kingdom comes, there will surely be tribulations. Through many tribulations we will enter the kingdom of God (Acts 14:22). Tribulations paved the way for John to enter the kingdom, and these tribulations worked out for him, more and more surpassingly, an eternal weight of glory (2 Cor. 4:17). He aspired for the kingdom, and therefore, he did not shrink from the tribulations. The kingdom will come, but it is still not here. If we do not endure, we will slumber, withdraw, or turn to the enticements of the world. John knew this; therefore, he waited patiently. He believed that his brothers would become fellow partakers in the tribulation and kingdom and endurance in Jesus. Praise the Lord! He was not alone in his way.
Excerpt From: Lee, Witness. “The Holy Word for Morning Revival – The Mending Ministry of John.” Living Stream Ministry.