An excerpt from my friend Prumsodun Ok's TED Fellows blog:
"First off: fight. Fight ignorance and darkness, fight injustice and deceit, fight inaction and fear, fight the left, fight the right, fight the center. Fight for love, fight for truth, fight for beauty, fight for health. Knowledge and wisdom is your sword. Use this powerful weapon of yours. Take care of it. Hone it. It is your responsibility to use it. "