All great questions must be raised by great voices, and the greatest voice is the voice of the people - speaking out - in prose, or painting or poetry or music; speaking out - in homes and halls, streets and farms, courts and cafes - let that voice speak and the stillness you hear will be the gratitude of mankind.
Don't ask what the world needs. Ask what makes you come alive, and go do it. Because what the world needs is people who have come alive.