Section 1: Sastrayonitvadhikaranam: Topic 3 (Sutra 3)
Brahman is realisable only through the scriptures.
Sastrayonitvat I.1.3 (3)
The scripture being the source of right knowledge.
Sastra: the scripture; Yonitvat: being the source of or the means of the right knowledge.
The Omniscience of Brahman follows from His being the source of scripture. The aphorism clearly points out that the Srutis alone are proof about Brahman.
As Brahman is the cause of the world we have to infer that Brahman or the Absolute is Omniscient. As the scripture alone is the means of right knowledge with reference to Brahman the proposition laid in Sutra 2 becomes confirmed. Brahman is not merely the Creator, Sustainer and Destroyer of the world, He is the source or womb of scriptures and is revealed by scriptures. As Brahman is beyond the reach of the senses and the intellect, He can be apprehended only on the authority of the Srutis which are infallible and contain the spiritual experiences of realised seers or sages. The Srutis declare that Brahman Himself breathed forth the Vedas. Therefore He who has brought forth the Srutis or the Vedas which contain such wonderful divine knowledge must be all-knowledge and all-powerful.
The scriptures illumine all things like a search light. Scripture is the source or the means of right knowledge through which you have a comprehensive understanding of the nature of Brahman. Srutis furnish information about what is not known from other sources. It cannot be known by other means of knowledge independently of the Srutis. Brahman is formless, colourless, attributeless. Hence it cannot be grasped by the senses by direct perception. You can infer the existence of fire by its accompanying smoke but Brahman cannot be established by inference or analogy, because it is attributeless and there cannot be a second thing which is similar to Brahman. Brahman is Infinite and secondless. He who is ignorant of the Srutis cannot know that Supreme Being. There are other means of knowledge also which have got a place but they are not independent. They supplement after Brahman is established by the Srutis.