The natural laws of the universe are inviolable... what you say and do determines what happens in your life... You are the master of your life and death. What you do is what you are.
The universe that we inhabit and our shared perception of it are the results of a common karma. Likewise, the places that we will experience in future rebirths will be the outcome of the karma that we share with the other beings living there. The actions of each of us, human or nonhuman, have contributed to the world in which we live. We all have a common responsibility for our world and are connected with everything in it.
We are the makers of our own lives. There is no such thing as fate. Our lives are the result of our previous actions, our karma, and it naturally flows that, having been ourselves the makers of our karma, we must also be able to unmake it.
Every act of charity, every thought of sympathy, every action of help, every good deed, is taking so much of self-importance away from our little selves and making us think of ourselves as the lowest and the least, and, therefore, it is all good. Here we find that Jnâna, Bhakti, and Karma - all come to one point.
From the scientific view, the theory of karma may be a metaphysical assumption -- but it is no more so than the assumption that all of life is material and originated out of pure chance