Why Jainism and Buddhism were rejected from the soil of india?

 

Why Jainism and Buddhism were rejected from the soil of India? What systems are qualified to be called as Orthodox?  How India influenced the Greek thought? Let's see the thoughts of Swamiji..

"From this ocean of the Vedanta, waves of light from time to time have been going Westward and Eastward. In the days of yore it travelled Westward and gave its impetus to the mind of the Greeks, either in Athens, or in Alexandria, or in Antioch. The Sânkhya system must clearly have made its mark on the minds of the ancient Greeks; and the Sankhya and all other systems in India hail that one authority, the Upanishads, the Vedanta. In India, too, in spite of all these jarring sects that we see today and all those that have been in the past, the one authority, the basis of all these systems, has yet been the Upanishads, the Vedanta. Whether you are a dualist, or a qualified monist, an Advaitist, or a Vishishtâdvaitist, a Shuddhâdvaitist, or any other Advaitist, or Dvaitist, or whatever you may call yourself, there stand behind you as authority, your Shastras, your scriptures, the Upanishads. Whatever system in India does not obey the Upanishads cannot be called orthodox, and even the systems of the Jains and the Buddhists have been rejected from the soil of India only because they did not bear allegiance to the Upanishads. Thus the Vedanta, whether we know it or not, has penetrated all the sects in India, and what we call Hinduism, this mighty banyan with its immense, almost infinite ramifications, has been throughout interpenetrated by the influence of the Vedanta."

- Swami Vivekananda (Complete Works of Swami Vivekananda - Lecture given at Calcutta)