दर्शयति च ॥ ४ ॥
darśayati ca || 4 ||
darśayati—Instructs; ca—also.
4. (The scripture) also instructs thus.
“That which all the Vedas declare” (Kath. 1. 2. 15) shows that the Nirguna Brahman is the one purport of all the Vedanta texts. Therefore all Vidyas relating to It must also be one. Thus the meditation on the Saguna Brahman as Vaisvanara, who is represented as extending from heaven to the earth in the Brihadaranyaka, is referred to in the Chhandogya as something well known: “But he who worships that Vaisvanara self as extending from heaven to the earth” (Chh. 5. 18. 1), thereby showing that all Vaisvanara Vidyas are one. Thus since the Nirguna or the Saguna Brahman is one and not many, therefore particular Vidyas which relate to either of them are also one and not many. This also follows from the same hymns and the like enjoined in one place being employed in other places for the sake of Upasana. The same rule applies to other Vidyas also besides the Vaisvanara, and in consequence they are not many, though differently described in different Sakhas.
The unity of Vidyas, having been established, their results are taken up for discussion.