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He's exactly right. The fact that we can have good thoughts and intention is enough to make a difference. If we are able to actually do good things and good deeds it does change the world. When you show a kind action to someone it makes them more happy. Even to greater extent, when you can inspire them they are more likely to want to become better person. Sometimes so inspiring that it can change coarse of life of the other person and they want to inspire others. Its like rippling effect of water. Even if you guys do not believe the book, you can at least open your mind to the intention he is trying to get across.