"There was a castle called Doubting Castle, the owner whereof was Giant Despair"

The quote from John Bunyan is a referral to a castle in his allegorical novel, The Pilgrim's Progress. In the novel, Doubting Castle is owned by Giant Despair, a character who symbolizes the despair and hopelessness that can include a life of sin. The castle is a place of terrific suffering and anguish, and it is a place where the lead character, Christian, should overcome his doubts and worries in order to continue his journey. The castle is a metaphor for the battles and temptations that a person need to deal with in order to reach redemption. The quote is a reminder that even in the darkest of times, one need to have faith and guts to conquer the obstacles in life and reach their supreme objective. It is a pointer that even in the face of despair, one should never quit hope.