prakṛti--kāraṇa yaiche ajā-gala-stana
ataeva-therefore; kṛṣṇa-Lord Kṛṣṇa; mūla-original; jagat-kāraṇa-the cause of the cosmic manifestation; prakṛti-material nature; kāraṇa-cause; yaiche-exactly like; ajā-gala-stana-nipples on the neck of a goat.
Therefore Lord Kṛṣṇa is the original cause of the cosmic manifestation. Prakṛti is like the nipples on the neck of a goat, for they cannot give any milk.
Just as a woman can deliver a child after being impregnated by the semen of a man, so material nature can supply the material elements after being glanced upon by Mahā-Viṣṇu. Therefore pradhāna cannot be independent of the superintendence of the Supreme Personality of Godhead. This is confirmed in the Bhagavad-gītā (9.10): mayādhyakṣeṇa prakṛtiḥ sūyate sa-carācaram. Prakṛti, the total material energy, works under the superintendence of the Lord. The original source of the material elements is Kṛṣṇa. Therefore the attempt of the atheistic Sāṅkhya philosophers to consider material nature the source of these elements, forgetting Kṛṣṇa, is useless, like trying to get milk from the nipplelike bumps of skin hanging on the neck of a goat.