Act as if what you do makes a difference.
What you believe makes a difference because your beliefs guide your actions and your actions–everything you do and say–make a difference. They make a difference to the results you achieve, to the success you experience, to the way others perceive you.
What you do as a manager makes a difference in another way, too. Everything you say and do makes a difference to the people around you. Your team watches everything you say and do closely: Are you really confident in their abilities? Are you really confident the new corporate vision is a good one? Are you really confident the plan will succeed?
Do you walk your talk? Do your actions as well as your words support the corporate values and vision? Do your actions and words help people perform at their best?