But still, an attempt is made here to elaborate it on the basis of certain concepts found in ancient Indian Scriptures. Vedanta maintains primacy of thought over matter - mind over body.
Thought is subtle matter that assumes grosser visible form.
The tendencies, desires, and thoughts choose suitable environment, parenthood, and circumstances to express or manifest themselves as 'bodies'. Hence, reincarnation actually means rebirth of tendencies. As desires are varying and unlimited, the creation of forms as bodies will also be innumerable and eternal. We can say that here the thought of hatred present in many people in minor degree has reincarnated in its strongest form. The desires may make a person a saint or a robber, selfish or selfless, happy or miserable.