You've gotta' say it. You've gotta' be the one to verbalize it to the person or persons whom you feel a conviction to say it to. You are the one from which the words need to come.
The encouraging word. The corrective word. The faith-filled word. The disciplining word. The challenging word. The paradigm-shifting word. The supportive word. The oppositional word.
If you don't, no one else will.
No one else has the insight you have. No one else has the relationship with the person that you do. No one else has the influence on this group of people like you have.
You abdicate your responsibility as a leader if you don't. You shouldn't be a leader if you can't. You will not be a leader if you won't.