Great vision precedes great achievement. Every team needs a compelling vision to give it direction. A team without vision is at worst, purposeless. At best, it is subject to the personal-and sometimes selfish-agendas of various teammates.
Author Ezra Earl Jones points out: "Leaders do not have to be the greatest visionaries themselves. The vision may come from anyone. The leaders do have to state the vision, however. Leaders also have to keep the vision before the people and remind them of the progress that is being made to achieve the vision. Otherwise, the people might assume that they are failing and give up."
If you lead your team, then you are responsible for identifying a worthy and compelling vision and articulating it to your team members.