Not taking more than you need.

Aparigraha is non-grasping — the practice of holding things, hours, outcomes, and even your own idea of yourself with an open hand rather than a closed one. It is the last of the five yamas, the ethical ground the whole of yoga is built on. What follows is thirty-five days of it: five gates, seven days each, moving from the easiest thing to release to the hardest. Nothing here is stored anywhere but on this device, and one part of it is designed to delete itself.