I found a nice song on YouTube. It is sung by a Japanese popular pop group called SMAP. I wish if they are better at singing... But the lyric is so nice.
Love & Peace Inside? (The link to YouTube)
"So many people wish peace in the world, but why don't people end wars?"
Right after we talked about it, we started a fight for a trifling matter.
Then, we were so upset that we stopped talking to each other.
We don't look like the ones who wish peace in the world.
We realized that our hearts are our world.
Our world that never stop fighting is the reflection of our hearts that never stop fighting.
If I change myself for better, the world will change for better, too.
We can bring peace to the world like that, in the way that nobody has ever imagined.
I'm going to change myself and I promise myself that I'll become the one who never have a fight for a trifling matter.
So I'll always ask myself,
"Do I have Love & Peace inside me?
Love & Peace Inside? （ユーチューブのリンクです）