As an OD professional. As an agent of change. Your primary challenge will not be systems or furniture or machines. It will be people. And their motivations. And you must posses a DEEP understanding of human beings and their motivations. And you will achieve this only when you have a DEEP understanding of your own motivations first.
The net is a wonderful place for serendipitous connections. I found this absolutely mindblowing blogpost that gave me goosebumps and I hope will give you a moment of reflection and some idea of what I refer to above.