In the Chandogya (I, 9) the following passage is met with, 'What is the origin of this world?' 'Ether,' he replied. 'For all these beings take their rise from the ether only, and return into the ether. Ether is greater than these, ether is their rest.'--Here the following doubt arises. Does the word 'ether' denote the highest Brahman or the elemental ether?--Whence the doubt?--Because the word is seen to be used in both senses. Its use in the sense of 'elemental ether' is well established in ordinary as well as in Vedic speech; and, on the other hand, we see that it is sometimes used to denote Brahman, viz. in cases where we ascertain, either from some complementary sentence or from the fact of special qualities being mentioned, that Brahman is meant. So, for instance, Taitt. Up. II, 7, 'If that bliss existed not in the ether;' and Ch. Up. VIII, 14, 'That which is called ether is the revealer of all forms and names; that within which forms and names are[117] that is Brahman.' Hence the doubt.--Which sense is then to be adopted in our case?--The sense of elemental ether, the purvapakshin replies; because this sense belongs to the word more commonly, and therefore presents itself to the mind more readily. The word 'ether' cannot be taken in both senses equally, because that would involve a (faulty) attribution of several meanings to one and the same word. Hence the term 'ether' applies to Brahman in a secondary (metaphorical) sense only; on account of Brahman being in many of its attributes, such as all pervadingness and the like, similar to ether. The rule is, that when the primary sense of a word is possible, the word must not be taken in a secondary sense. And in the passage under discussion only the primary sense of the word 'ether' is admissible. Should it be objected that, if we refer the passage under discussion to the elemental ether, a complementary passage ('for all these beings take their rise from the ether only, &c.') cannot be satisfactorily accounted for; we reply that the elemental ether also may be represented as a cause, viz. of air, fire, &c. in due succession. For we read in Scripture (Taitt. Up. II, 1), 'From that Self sprang ether, from ether air, from air fire, and so on.' The qualities also of being greater and of being a place of rest may be ascribed to the elemental ether, if we consider its relations to all other beings. Therefore we conclude that the word 'ether' here denotes the elemental ether.