NONATTACHMENT

Patanjali defines nonattachment as self-mastery, meaning, as he put it, "freedom from desire for what is seen or heard."  

The nonattached person, attached only to God, has no interest in possessing objects of the senses or the fruits of his actions.

He performs his work as karma yoga, which is union with God through selfless activity, and sees the world and all living beings as manifestations of the Divine. 

Nonattachment does not mean indifference to one's work and fellows.  On the contrary, it denotes a profound regard for them, only without the sense of "me" and "mine."

--Without the sense of "me" and "mine" because the goal of nonattachment ultimately is freedom from the one attachment that is the most problematic for us, our egoic self.  Self-mastery is mastery over who we think we are but aren't.