Brahman (the intelligent principle) is the first cause

Topic 5 (sutras 5 - 11) : Ikshatyadyadhikaranam [Ikshateh: on account of seeing; adhikaranam: section, topic, proposition]

I.1.5
ईक्षतेर्नाशब्दम् |
Ikshaternaashabdam
On account of seeing (i.e thinking being attributed in the Upanishads to the cause of the world; the pradhana*) is not (to be identified with the cause indicated by the Upanishads; for) it is not founded on Scripture

*Saankhya philosophy puts forth an argument that the first cause of this world is pradhana (matter) which is a non-intelligent entity

Ikshateh(ईक्षते): on account of seeing (thinking); Na(न): is not; Ashabdam(अशब्दम्): not based on the scriptures


Commentary:
This sutra is stating that the cause of the world can be attributed only to the intelligent principle called Brahman and no other entity

Background

Introduction - part1, part2, part3, part4

Sutra - I.1.1, I.1.2, I.1.3, I.1.4

Brahman is the main purport of all scriptures

Topic 4: Samanvayadhikaranam [Samanvaya: coordination; adhikaranam: section, topic, proposition]

I.1.4
तत्तु समन्वयात्
Tattu Samanvayat
But that(I.1.3 Brahman is to be known only from the scriptures and not independently by other means is established), because it is the main purpose (of all scriptures)

Tat(तत्): that; Tu(तु): but; Samanvayat(समन्वयत्): coordination, on account of agreement or harmony, because it is the main purpose

Commentary:
Brahman or the absolute can be known only through the scriptures because all the passages of the scriptures can be harmonized only by such a doctrine. The scriptures refer to Brahman only because they have Brahman as their main topic. A very important point to be noted here is, Brahman cannot be realized through scriptures. Scriptures aims only at removing the ignorance about Brahman.

Background

Introduction - part1, part2, part3, part4

Sutra - I.1.1, I.1.2, I.1.3