Revelation 2:9 I know your tribulation and poverty (but you are rich) and the slander from those who call themselves Jews and are not, but are a synagogue of Satan.
To the church, tribulation is a test of life. The extent to which the church experiences and enjoys the resurrection life of Christ can only be tested by tribulation. Moreover, tribulation also brings in the riches of the resurrection life of Christ. The Lord’s purpose in allowing the church to suffer tribulation is not only to testify that His resurrection life overcomes death, but also to enable the church to enter into the riches of His life. Hence, tribulation is precious to the church.
- "Life Study of Revelation" P131