Pay attention to what is important, not just what is quantifiable. - Donella Meadows

There always will be limits to growth.

Systems thinking can only tell us to do these things. It can't do them for us. And so we are brought to the gap between understanding and implementation. Systems thinking by itself cannot bridge that gap. But it can lead us to the edge of what analysis can do and then point beyond—to what can and must be done by the human spirit.

The least obvious part of a system, its function or purpose, is often the most crucial determinant of the system's behavior.