Unconscious drives and conscious feelings motivate behavior such as emotional expression. An infant cries to express its sense of helplessness and insecurity. Its behavior elicits a compassionate, nurturant response from its mother. Over millions of years of evolution, natural selection (through DNA programming) has favored the innate behaviors of both child and mother.
Your expressed emotion must be a deep and genuine part of your character—not merely intended to promote an agenda. Values and feelings motivate virtuous actions. For example, hope and compassion motivate your actions to effect local or global justice, peace, and harmony.
In successful communication, strong emotion usually conveys and stimulates a similar emotion, enhances the appeal of ideas, and results in a desired outcome. Assert yourself—use emotional emphasis in communicating your wishes, needs, innovative ideas, and carefully reasoned vision. You cannot be dispassionate—your emotional tone and intensity must be persuasive.