Tru-Thinking - In the Book of John, he points to stories where Jesus returns to the issue of faith again and again. The crowds are fickle, believing sometimes and not others. The religious leaders refuse to believe because Jesus doesn’t fit their paradigms.
The disciples and close friends constantly face situations that challenge their faith, and this especially happens when Lazarus dies. John is implicitly urging his readers to have faith in Christ, even in difficult times, because He is the source of life and well being.