Leaders have followers. The primary role of a leader is to convey to those followers a sense of purpose, vision, and mission.
Have a vision; but it's not enough to have a vision, you have to communicate that vision to others. You have to communicate it to people who work with you and for you. You have to communicate it to the world leaders with whom you come in touch.
With vision only, you get no follow-through. With enforcers only, the vision is realized but leaves a lot of wreckage.
Politics is different, because the mission is always to get the necessary votes. A good politician goes through everything in terms of mission and vision, and resourcing, but at the end of the day politicians have to make compromises in order to achieve consensus.