The most powerful thing you can do to change the world, is to change your own beliefs about the nature of life, people, reality, to something more positive... and begin to act accordingly.
Life has a bright side and a dark side, for the world of relativity is composed of light and shadows.
If you permit your thoughts to dwell on evil, you yourself will become ugly.
Look only for the good in everything, that you absorb the quality of beauty.
Lead me from death to life, from falsehood to truth.
Lead me from despair to hope, from fear to trust.
Lead me from hate to love, from war to peace.
Let peace fill our heart, our world, our universe.
This is the way of peace. Overcome evil with good, and falsehood with truth, and hatred with love. The Golden Rule would do as well. Please don't say lightly that these are just religious concepts and not practical. There are laws governing human conduct, which apply as rigidly as the law of gravity. When we disregard these laws in any walk of life, chaos results. Though obedience to these laws this frightened, war-weary world of ours could enter into a period of peace and richness of life beyond our fondest dreams.