[Advaita-l] Brahman and universe

[Durga Janaswamy]

Hari Om, 
Pranams.

Bhagawan Sankaracharya says in  Brahma Sutra 3.2.21  दर्शनाच्च  (उभयलिङ्गाधिकरणम्) that 
ब्रह्मस्वभावो हि प्रपञ्चः, न प्रपञ्चस्वभावं ब्रह्म.  

(Brahma Sutra 3.2.21 darshanAchcha in  ubhayali~NgAdhikaraNam)
brahmasvabhAvo hi prapa~nchaH, na prapa~nchasvabhAvaM brahma

For this phenomenal universe of manifestations has Brahman as its essence and not that Brahman has the phenomenal manifestations as Its essence.

Please elaborate this statement.

Thank you and regards
-- durga prasad