Who are you? First, look at yourself. Look at your hands.
Go ahead. Have a good look. Are you your hand? Are you your face?
Are you your body? Are you your mind? Are you the center of the universe;
or merely a tiny insignificant creature in a remote corner of creation?
These questions have challenged mankind's greatest thinkers since the dawn of civilization.
We are surrounded by material elements. These are the same elements that make up the body of all living creatures. And then there is mind, intelligence and ego. And beyond all that; consciousness. This is not material. It is the soul.
By nature's invincible laws each soul continually passes through progressively higher species of life until it inhabits a human form.
The soul cannot be measured with any scientific instrument. Yet this minute non-material entity, the soul, is so powerful that it unceasingly activates each body throughout it's entire lifetime. This tiny little spark of life thus moves from one body to another. This is called reincarnation.
It is not difficult to understand. Even in our own life we live in different bodies. Medical science has demonstrated that all of our cells are replaced every seven yearsincluding even the brain. On the battlefield Krishna tells Arjuna, "As the embodied soul continually passes, in this body, from boyhood to youth to old age, the soul likewise passes into another body at death. The self-realized soul is not bewildered by such a change."
And there you are, the soul with a human body and the chance to break through the cycle of birth and death.