It is indeed true that in the Upani@sads there is a large number of texts that describe the ultimate reality as the Brahman, the infinite, knowledge, bliss, and speak of all else as mere changing forms and names. The word Brahman originally meant in the earliest Vedic literature, _mantra_, duly performed sacrifice, and also the power of sacrifice which could bring about the desired result [Footnote ref 320]. In many passages of the Upani@sads this Brahman appears as the universal and supreme principle from which all others derived their powers. Such a Brahman is sought for in many passages for personal gain or welfare. But through a gradual process of development the conception of Brahman reached a superior level in which the reality and truth of the world are tacitly ignored, and the One, the infinite, knowledge, the real is regarded as the only Truth. This type of thought gradually developed into the monistic Vedanta as explained by S'ankara. But there was another line of thought which was developing alongside of it, which regarded the world as having a reality and as being made up of water, fire, and earth. There are also passages in S'vetas'vatara and particularly in Maitraya@ni from which it appears that the Samkhya line of thought had considerably developed, and many of its technical terms were already in use [Footnote ref 321]. But the date of Maitraya@ni has not yet been definitely settled, and the detailsfound there are also not such that we can form a distinct notion of the Sa@mkhya thought as it developed in the Upani@sads. It is not improbable that at this stage of development it also gave some suggestions to Buddhism or Jainism, but the Sa@mkhya-Yoga philosophy as we now get it is a system in which are found all the results of Buddhism and Jainism in such a manner that it unites the doctrine of permanence of the Upani@sads with the doctrine of momentariness of the Buddhists and the doctrine of relativism of the Jains.