Hinduism- What is Brahman??

                                                               BRAHMA  SUTRA

Bhedavyapadesachchanyah                CHAPTER I. SECTION1.SUTRA 21 (21)

Bheda: difference; Vyapadesat: because of declaration; Cha: and, also;

Anyah: is different, another, other than the Jiva or the individual soul.

Anyah: (Sarirat anyah: other than the embodied individual soul). Moreover

there is one who is distinct from the individual souls which animate the Sun and

other bodies, viz., the Lord who rules within. The distinction between the Lord and

the individual souls is declared in the following passage of the Srutis, “He who

dwells in the Sun and is within the Sun, whom the Sun does not know, whose

body the Sun is and who rules the Sun from within, is thy Self, the ruler within,

the immortal (Bri. Up. III-7-9). Here the expression “He within the Sun whom the

Sun does not know” clearly shows that the Ruler within is distinct from that

cognising individual soul whose body is the sun. The text clearly indicates that the

Supreme Lord is within the Sun and yet different from the individual soul

identifying itself with the Sun. This confirms the view expressed in the previous

Sutra. It is an established conclusion that the passage under discussion gives a

description of the Supreme Lord only but not of any exalted Jiva.

Simple explaination.

Whatever you know about brahman is not brahman.Enquiring about brahman is very important.The reason you dont understand the whole brahman is because you dont understand yourself.The minute you know something and having problem with another one is god.The process should go until you dont have anything to enquire about brahman.Anything known to you is not god,there is more than that.How much you know god is not god.How much you dont know about god is god.In nutshell Brahma sutra is encouraging turn inward to find the brahman.