Buddhism, which is founded on the law of cause and effect, stress the concept of karma. This principle explains that life at each moment is subject to the cumulative effects of causes we made in the past. What we do, what we think are all causes. And according to Buddhism, the moment we do something, say something or think something, an effect is registered in the depths of our being. Then, as our lives meet the right circumstances, the effect becomes apparent. Personality traits are strongly connected to our karma. The good news is that, unlike fate, our karma can be changed by causes we make from this moment forward. In fact, the practice of Buddhism is essentially the practice of continually changing our karma.
(Credit Daisaku Ikeda for the philosophy)