Dr. Brand: We must confront the reality that nothing in our solar system can help us.
Cooper: Now you need to tell me what your plan is to save the world.
Dr. Brand: We're not meant to save the world. We're meant to leave it, and this is the mission you were trained for.
Cooper: I've got kids, professor.
Dr. Brand: Then get out there and save them. We must reach far beyond our own lifespans. We must think not as individuals but as a species. We must confront the reality of interstellar travel.