In "The Lion, the Witch and the Wardrobe" by C.S. Lewis, the story revolves around the adventures of four siblings who find themselves in the magical land of Narnia. As they navigate various challenges and confront the Witch, they learn that accomplishing their goals might not be as straightforward as anticipated. The quote, "All shall be done, but it may be harder than you think," serves as a reminder that while success is possible, the path to achieving it often involves unexpected trials and difficulties.

This insight encourages readers to be prepared for the challenges that lie ahead, even when pursuing noble causes. The characters learn valuable lessons about courage, teamwork, and perseverance as they face obstacles and grow through their experiences. Ultimately, their journey illustrates that determination is essential, and one must be ready to overcome unforeseen difficulties on the way to realizing one's objectives.