Find a human-interest story that moves you greatly. Then tell it so true to life that your audience is moved the same way you are.
Appeal to the nobler motives of the audience.
Dramatize! Share your passion, your feelings, your commitment, your emotions. Let it all hang out. Hold nothing back.
Be clear in what you want your listeners to do.
Rely on an intellectual argument alone. The issue here is passion, not rules.
Worry about being vulnerable. Your vulnerability is central to the power of the talk.
Hold back. This talk will be successful if you give everything you've got to make it so.
Remain seated. Sitting drains you of power. Stand straight and tall and speak from the heart!