  "Nothing happens by chance, to say that things happen by chance is to be ignorant of the reality of cause and effect" -The 14th Dali Lama Its that Blindingly Simple , lets take a Simple Example... A dice roll, some say its by chance on what you roll, and when you go to the casino its based on luck right!? The dice roll happens because of the original way you held the dice, and the amount of force and pressure you applied to it with your hand (or whatever else you rolled it with ;)) and the direction it rolled, or whatever it bumped into and any other factor that take place.
This idea occurred to me the other day, and it is actually quite possible. You could develop a dice roll where you will always roll a 6, or whichever you want to roll, if set up correctly. And Hey ITS NOT CHEATING, its just using your brain. You and the Dice. You could perfect this and constantly win at playing Craps at the casino until your a Millionaire. Everything in a casino is like this, its all based on what action took place before hand, or prior to the action, that led up to what took place at that moment.
You cant deny this. Try it with your own mind. Think of something that you would say is completely random, then battle it with the actions that were needed to make it happen, and you'll see, that it was not by chance what happened. I ask you to try and disprove this. Write me a comment about something that you feel happened in your life by chance, and not by cause and effect. What im getting at is the basis of Karma . It is a 'spiritual law' if you will, saying that your actions effect you, and come back to you . The old 'Live by the sword and die by the Sword' saying CoAbUlAtEs with this. Although at first many will say its nonexistent, if they would just look at what it Actually IS though then they will see how true it Actually IS .
Its the same principle of Cause and Effect ...Over a short term, or long term time period of action(s) that you commit result in a certain action(s) taking place. The principle of Karma goes a little deeper though, but I will stay on the surface of it, only scratching it at the moment. What your intent is in doing an action effects the actions it will cause upon you. It may take a while for ones 'actions' to come back to them , or could happen within seconds.
It teaches people lessons. don't hurt him or her or you'll be hurt. Yes Yes Help Him or Her! And look now everyone is helping you! But this principle cant be used selfishly to bring you things to make you happy, such as, if you wish to get something from someone, you be nice to them and then you use them, guess again pal (or pala), this isn't going to make you happy .
Again its the Intent that counts too. Some say Intent is Everything in an action, and it may very well be. When someone understands the law of Karma, they cannot blame anyone or anything that happens to them on anyone or anything else except themselves. And then, only after they accept responsibility for these things that are happening to them, can they realize the action they set in motion that caused this thing or these things to happen to them, ultimately resulting in them changing their ways, thus eventually changing everything that's displeasing them from happening to them. This is Indeed a very helpful tool when understood. Good Luck and God Karma =-) 
