Karma...

       The law of karma states unequivocally that though we cannot see the connections, we can be sure that everything that happens to us, good and bad, originated once in something we did or thought. We ourselves are responsible for what happens to us, whether or not we can understand how. It follows that we can change what happens to us by changing ourselves; we can take our destiny into our own hands.

Krishna-Dwaipayana Vyasa, The Bhagavad Gita