This thread is to answer some important questions Neitzsche PMed me with regarding a situation where his peers are making fun of his beliefs of reincarnation by trivialising it by saying, “Haha, you believe you going to get reincarnated as a catapillar in your next life” This is the usual strawman detractors of reincarnations make.
[B][U]The science of reincarnation[/U][/B]
Swami Vivekananda answered this question very simply when he was giving a lecture to a Western audience on reincarnation. It is clear if we look at the third law of thermodynamics that energy cannot be created or destroyed, it can only be converted from one form to the other. Simply put everything which is made out of energy goes back to energy. The body which is made up of the matter of flesh and bones is made out of energy, so it goes back to energy. However, what about the mind? Is the mind like flesh, bones and chemicals? Not at all. The mind is first of all has no position in time and space like other things. The brain has a position in time and space and hence why we can see it and touch it, but nobody can see and touch a mind. The mind does not obey the laws of space and time. It is not bound to the present, the past or the future. I can go back in my mind to a time when I was 5 and jump to a time when I was 20. Similarly I can go to any place in the world right now within my mind.
It is clear then the mind is not the same substance as physical matter it is a different substance altogether: consciousness. Therefore just as physical matter returns to physical energy; the mind returns to consciousness. (Indeed, isn’t that what is happening everytime you go to sleep?)
Now recall Einstein’s law E=Mc^2. Matter and energy are constantly converting into one another and the sequence is reversible; energy becomes matter and matter becomes energy. Similarly, it is true for the mind and consciousness. Mind and consciousness are constantly converting into one another. However, can consciousness convert into mind; mind convert into energy and energy convert into matter? Absolutely, otherwise how could you incarnate in the first place. If mind did not convert into matter then how could the phenomenon of psychosomatic effects be explained? How could you explain something as simple as moving your arm if your thought energy did not convert into electrical energy?
Now note something when energy becomes matter energy is still existent in the matter. In other words we know what appears to be matter is actually just condensed energy. However, the same cannot be said for energy that energy is condensed matter: liquid states obviously exist before solids state and not vis versa. Similarly, mind precedes energy and matter. Before matter is even existent it exists as thought energy which in turn is a transformation of the substance of consciousness. When an incarnation happens consciousness evolves into matter. So what is matter ultimately? Matter is condensed consciousness.
Each of us is a mind and each of our minds is a transformation of the original consciousness substance. As each mind is distinct, each body the mind manifests is distinct. An animal mind is different to a human mind for instance, thus the body the animal mind manifests is an animal body and not a human mind. However, what if you could get one with an animal body to think like a human mind and get one with a human body to think like an animal mind? Then it would so happen that in their next incarnation the animal body now with a human mind will develop a human body; and the human body now with an animal mind will develop an animal body.
The moral here is think, act and speak like a human and you will not have to worry about becoming an animal in your next life. In fact it is rare for a human to regress to an animal form once it becomes a human as evolution tends to go up, only a human who has engaged in animal thoughts, acts and speech too much will fall back - such as a cannibal.