The world that we live in relies on rules and laws. Physical laws such as the law of gravity, and mental laws such as the law of attraction, and positive thinking. There are other laws just as invisible and intangible but just as real. When you give time, energy or money to others you are taking advantage of another law that may have many names, let's call it "the law of sowing and reaping."
Some of the most successful and powerful people who have ever walked the earth have been people that have understood and benefited from this law. If you look at some of the most financially successful people in the world right now you will probably find that they are also the biggest philanthropists. You may say "sure if I had Millions of dollars in my bank account I would give away lots of money too". What we fail to see is that many times these individuals became successful through business models that made charitable giving a part of their mission statement. Philanthropy is part of the reason that they are successful to begin with! The cynic will say "yeah but they give just because they want tax breaks or good press". That may be so, but regardless of motive giving is an investment that returns every time. It may not always come back in the form that you seek, ie an immediate monetary return, but it comes back to you in one way or another like a boomerang. The reason that I like to refer to it as sowing and reaping is because it doesn't just come back to you in the same measure, but much like sowing a seed it grows and comes back tenfold.
Not to say that everyone who is rich gives money to others. Some people scratch and claw their way up the financial ladder driven by greed and give up their humanity in the process of making money. In that sense what they are doing isn't making money, it is trading money for pieces of their soul. These people will most likely accumulate the material things and bank accounts that they desire and in the end find themselves unhappy because of what they lost in attaining it.
The most interesting thing about this law is the fact that it seems to defy logic and reason. It isn't based upon the capitalistic system that our brains understand. To our reasoning mind, "giving money means losing money, therefore how can it put me any further ahead financially?" I would be lying if I said that I knew exactly how it works, I just know that it works. One of the most beautiful things about giving to others is that it is virtually impossible to go wrong. So if you don't give much right now. Start giving a little and see what happens, you may be surprised.