Bhagavad Gita 13.4

13.4 What the field is and of what nature, what are its modifications and whence it is and also who He is and what His powers are hear all that from Me in brief.

Now please hear My brief description of this field of activity and how it is constituted, what its changes are, whence it is produced, who that knower of the field of activities is, and what his influences are.