If you want to make a difference around you, begin with what you say. Choose words carefully — choose words that lift and inspire people. Consider too how you say something, and most importantly, why you say something. It may be best to not say anything at all.
I was taught as a kid that we have 2 ears and 1 mouth to demonstrate that we should listen twice as much as we speak. Make your words count, and consider what you need to do to rise above how you feel, and speak from a place of love, not anger or emotion (no matter how justified you feel you are). This is a lesson I am learning myself, every single day. Speak up when you know you should, and be a voice of encouragement and positivity every single time. A calm, confident, and understanding voice will have more impact than you could ever know.