In the book "An Echo in the Bone" by Diana Gabaldon, the quote "I've heard it said that a man's reach must exceed his grasp—or what's a heaven for?" reflects a profound idea about ambition and aspiration. It suggests that individuals should aim higher than their current capabilities, as this pursuit of greater goals is what gives life meaning. The phrase implies that striving for the seemingly unattainable enriches our existence and motivates us to push beyond our limits.

This sentiment resonates through the narrative, emphasizing how characters grapple with their desires and limitations. By reaching for what lies beyond their immediate reality, they find purpose and hope, portraying the essence of human ambition. The idea of aiming for a 'heaven' underscores the belief that the journey toward our dreams is vital, regardless of whether we achieve them, as it leads to personal growth and fulfillment.