I also very much like this quote. This is Reata Strickland, as far as I can tell. I remember seeing it on /r/trees as a Dalai Lama quote, but wikiquote [1] says otherwise. Reata's website [2] seems to be the closest source.

[1] http://en.wikiquote.org/wiki/Tenzin_Gyatso,_14th_Dalai_Lama#... [2] http://www.reata.org/interview2.html