Asked the student: "Wise man, science gave us the law of preservation of energy: no energy can be created, nor can any energy be destroyed, ever. How can I use this knowledge to support our believe in reincarnation? After all, our bodies are destroyed, and new bodies are created constantly."

Replied the teacher: "Did you look at our moon? Every month it follows a cycle. It grows from a slight arc into a big shiny disc, after which it withers and depletes into nothingness... then for a couple days it is amiss... but soon thereafter it is reborn to brighten our nightly sky for another month."

Retorted the student: "But the only thing changing about the moon are its phases... the moon itself is still there, still a planetoid circling ours, whether we see it or not."

Answered the teachter: "Exactly", and left the student to ponder.