It is not destiny however, because through the use of our Free Will, new causes are constantly being introduced. The purposes of our experiences on earth are to learn more lessons about giving and receiving love, to become spiritual beings enjoying our human experiences, to be living examples of Gods' love, and to attain union with God. When we achieve these goals, we achieve our Soul's purpose for reincarnating and free it from the Cycle of Rebirth to move on to higher learning. When we live in opposition to these, we create more karma causing our Soul to need to reincarnate again and again. Karma and reincarnation are inseparable from each other.
Reincarnation is the law of return, of evolution in action, and karma is the cause of that return.
Karma is the law of adjustment, it neither rewards nor punishes, but adjusts the scales to bring balance. Karma and reincarnation fit scientific principles concerning energy. Energy can neither be created nor destroyed, only transformed. For every action there is an equal reaction. All matter is subject to decay.