What does the Bible say about the believer's trials?

The Bible points out that believers will encounter various trials throughout their lives. In Mark 13, Jesus warns His disciples that they will face persecution and hardship because of their faith. This suffering is part of the natural effect of sin, as sin enters the world and manifests in sorrow, pain, and tribulations for everyone. Additionally, in John 16:33, Jesus states, 'In the world you shall have tribulation,' reminding us that trials are a promised reality for those following Him. Instead of being surprised, believers are called to endure these challenges, knowing that they are shaped by a sovereign God for the purpose of teaching them dependence on Him and facilitating the spread of the gospel.