Vanisource:Sloka of the day/November 22, 2008
so 'haṅkāra iti prokto
vikurvan samabhūt tridhā
vaikārikas taijasaś ca
tāmasaś ceti yad-bhidā
dravya-śaktiḥ kriyā-śaktir
jñāna-śaktir iti prabho
The self-centered materialistic ego, thus being transformed into three features, becomes known as the modes of goodness, passion and ignorance in three divisions, namely the powers that evolve matter, knowledge of material creations, and the intelligence that guides such materialistic activities. Nārada, you are quite competent to understand this.