SB 11.22.33

yo ’sau guṇa-kṣobha-kṛto vikāraḥ
 pradhāna-mūlān mahataḥ prasūtaḥ
ahaṁ tri-vṛn moha-vikalpa-hetur
 vaikārikas tāmasa aindriyaś ca
Synonyms: 
yaḥ asau — this; guṇa — of the modes of nature; kṣobha — by the agitation; kṛtaḥ — caused; vikāraḥ — transformation; pradhāna-mūlāt — which is generated from the pradhāna, the unmanifest form of the total material nature; mahataḥ — from the mahat-tattva; prasūtaḥ — generated; aham — false ego; tri-vṛt — in three phases; moha — of bewilderment; vikalpa — and material variety; hetuḥ — the cause; vaikārikaḥ — in the mode of goodness; tāmasaḥ — in the mode of ignorance; aindriyaḥ — in the mode of passion; ca — and.
Translation: 
When the three modes of nature are agitated, the resultant transformation appears as the element false ego in three phases — goodness, passion and ignorance. Generated from the mahat-tattva, which is itself produced from the unmanifest pradhāna, this false ego becomes the cause of all material illusion and duality.
Purport: 

By giving up one’s false ego of identification with the three modes of nature, one can achieve Kṛṣṇa consciousness, the pure, original state of existence. The word moha-vikalpa-hetuḥ indicates that because of false ego one considers himself to be the enjoyer of nature and thus develops a false sense of material duality in terms of material happiness and distress. False ego is removed by identifying oneself as the Lord’s eternal servitor in full Kṛṣṇa consciousness.