Robert T. Kiyosaki said this quote

Whenever you feel short or need of something, give what you want first, and it will come back in buckets. That is true for money, a smile, love or friendship. I know it is often the last thing a person may do, but it has always worked for me. I trust that the principle of prosperity is true, and I give what I want. I want money, so I give money, and it comes back in multiples. I want sales, so I help someone else sell something, so sales come to me. I want contacts, and I help someone else get contacts. Like magic, contacts come to me. I heard a saying years ago that went: god does not need to receive, but humans need to give. My rich dad would often say: poor people are more greedy than rich people. He would explain that if a person is rich, that person is providing something that other people wanted...whenever I think people aren't smiling at me, I simply began smiling and saying hello. Like magic, the next thing I know: I'm surrounded by smiling people. It is true that you world is only a mirror of you. So that's why I say, teach and you shall receive.