Tribulation Friend or Foe

Rev 1:9

"I John, who also am your brother, and companion in tribulation, and in the kingdom and patience of Jesus Christ. "

In the new Testament, we are taught to glory (to boast in) only two things. The cross and tribulation. The cross isn’t effective without tribulation and tribulation doesn’t work without the cross. What does tribulation mean and how should it be applied to our daily walk? The 4th man in the fire