By cultivating these limbs of knowledge, one attains self-realization. In other words, one is elevated from mundane knowledge of the kṣetra to spiritual knowledge of the kṣetra-jña. We have previously established that the word kṣetra-jña implies both the living entity and the Supreme Brahman. Sometimes material nature, or prakṛti, is referred to as Brahman, the reason being that Brahman is the cause of the material nature. In one sense a cause and its effect are identical. But Lord Kṛṣṇa is the ultimate source of Brahman. The Lord impregnates Brahman in the form of the material nature with the seed of Brahman known as the jīva. As Kṛṣṇa says in the Bhagavad-gītā (BG 14.3),
- mama yonir mahad brahma
- tasmin garbhaṁ dadhāmy aham
- sambhavaḥ sarva-bhūtānāṁ
- tato bhavati bhārata
The total material substance, called Brahman, is the source of birth, and it is that Brahman that I impregnate, making possible the births of all living beings, O scion of Bharata.
This verse explains the famous saying sarvaṁ khalv idaṁ brahma from the Upaniṣads, meaning "Everything is Brahman." In other words, the Supreme Brahman, Lord Kṛṣṇa, is identical with both the jīva and prakṛti in that they are all Brahman. Thus in one sense the Vaiṣṇavas are pure monists. Previously we deliberated upon another verse from the Bhagavad-gītā (BG 9.10):
- mayādhyakṣeṇa prakṛtiḥ
- sūyate sa-carācaram
- hetunānena kaunteya
- jagad viparivartate
This material nature, which is one of My energies, is working under my direction, O son of Kuntī, producing all moving and nonmoving beings. Under its rule this manifestation is created and annihilated again and again.
The Gītā verse under discussion (BG 14.3) gives a clearer understanding of the other verse (BG 9.10).