How do we know tribulation is part of the Christian life?

The certainty of tribulation in the Christian life is illustrated through the words of Jesus and backed by the experiences recorded in Scripture. In John 16:33, Jesus assures His disciples that they will face tribulation, a truth echoed in the Apostle Paul's writings, such as in Acts 14:22 where he states that we must, through much tribulation, enter into the kingdom of God. These teachings serve not only as warnings but also as encouragements, reminding believers that tribulation is a shared experience that connects them to the suffering of Christ.