Long-term vision—what some might call a mission—can see us through the errors of our attempted long-term planning.
Good planning is a continual process that requires agility, resilience, and adaptability. But those same qualities—valuable as they may be—won't on their own keep a person, family, group, or organization grounded in core principles and values.
But a well-discerned and well-articulated vision? That allows for all three—agility, resilience, and adaptability—without losing sight of what matters most.