In "Lonesome Dove" by Larry McMurtry, the protagonist experiences a profound sense of maturity and fulfillment as he steps out into the open space to catch his horse. This moment signifies a pivotal transition in his life, where he feels a deep connection to his surroundings and a newfound sense of responsibility. It is a defining point where he embraces his identity and the challenges that come with it.

This moment encapsulates the themes of growth and self-discovery prevalent in the novel. As he interacts with the land and his horse, he recognizes his own strength and purpose, realizing that he has grown into his own person. Such experiences highlight the journey of life and the innate desire to find completeness within oneself.