Peace in the world begins in the heart...

"If you want to bring about peace in the world, first bring about peace within yourself. Don't worry about reforming the world; reform yourself! The peace that you would have others find must first be found in your own heart. How can you say to another, 'Let me take a speck out of your eye!' when you have a bigger one in your own? First remove the speck from your own eye, and then you will be able to remove that of your brother.

Does this mean that one must be a fully realized spiritual master before one can teach or offer service? No, not at all. If we waited for everyone to be perfect before anyone could teach, we would have a long wait indeed. It is sufficient to teach what we know and have directly experienced. In this case, teaching is really a sharing, a comparing of notes. It is as if we are all working together on a huge jigsaw puzzle. As you find the place for your piece, you make it easier for me to see the pattern and the place for mine. You might even find a piece that I can use. Teaching is sharing. We have nothing to teach each other, but much to share." 

[Cohen, The Dragon Doesn't Live Here Anymore]