"___ is a cat purring in my lap 'cause it loves me" (5)
I believe the answer is:
karma
(Other definitions for karma that I've seen before include "(Of angle) more than ninety degrees, insensitive" , "Buddhist principle of inevitable consequence" , "(In Hinduism or Buddhism) this decides one's fate in a future existence" , "Actions determining destiny" , "Lifetime's actions that set fate for next life" .)