For the vision to be taken seriously, the destination- or the goal- has to be attainable. It's your vision, so you need to determine the timing. With your destination in focus, you need to describe who you are, what you do, and how you are going to get there.
For a great leader, colleague, friend, or parent to be his best, he has to acknowledge his worst. Throughout my life I've met plenty of superheroes, but the strongest and most effective among them were simply human and knew they weren't perfect. They were the men and women who, like my father, believed in their duty to country and sacrificed for others without hesitation. They all had their strengths and weaknesses. They excelled at times; they stumbled at times. But the great ones always made sure they could walk tall by recognizing their own enemy within and confronting it.
If you don't know where you're going, any road will take you there.