PURPORT

In Bhagavad-gita (7.14) it is said, daivi hy esa gunamayi mama maya duratyaya: the external potency of the Supreme Personality of Godhead is extremely strong. Indeed, everyone is fully captivated by her activities. Lord Sambhu (Siva) was not to be captivated by the external potency, but because Lord Visnu wanted to captivate Him also, He exhibited His internal potency to act the way that His external potency acts to captivate ordinary living entities. Lord Visnu can captivate anyone, even such a strong personality as Lord Sambhu.