Thank You green card

This card show the following on the front side :

Thank You for your efforts to Free The Phone

And on the back side, the following Lao Tze quote :

Thirty spokes share the wheels's hub
It is the center hole that makes it useful
Shape clay into a vessel
It is the space whithin that makes it useful
Cut doors and windows for a room
It is the holes which make it useful
Therefore benefit comes from what is there
Usefulness from what is not there.

Lao Tze