Karma Te Sarga, a Creative Force

Karma is at creative force which causes the unmanifest universe to become manifest. In that context, shrikrishtna calls karma te sarga,. It's not the most common way of defining karma, but it's what shikisha chose to focus on in his brief explanation to to argna. So argin askd what is karma? And shukisna's response, he responds briefly, i can't be as brief elsri christa.