In fact, ambitious tension actually limits our ability to succeed because it keeps us in a state of contraction emotionally and physically. It seems to give us energy but doesn't really.  Like the white sugar of mental health, there's a short high followed by a crash.  The cultivation of mental rest or surrender is like eating healthy food.  It doesn’t give us an immediate rush, but over time it provides a lot more energy.

A Return to Love: Reflections on the Principles of "A Course in Miracles"