What does the Bible say about Thomas and unbelief?

In John 20:24-29, Thomas, one of the twelve disciples, declared that he would not believe Christ had risen unless he saw and touched His wounds. This moment reveals the depth of human doubt, emphasizing that even those close to Christ can struggle with faith. Despite Thomas's doubting, Jesus compassionately visited him and invited him to touch His scars, showing a willingness to strengthen Thomas’s faith. This highlights the importance of Christ's grace toward our weaknesses and the assurance that He meets us in our doubt, urging us to believe.