Enthusiasm "wants" nothing because it lacks nothing. It is at one with life and no matter how dynamic the enthusiasm-inspired activities are, you don't lose yourself in them. And there remains always a still but intensely alive space at the center of the wheel, a core of peace in the midst of activity that is both the source of all and untouched by it all. Through enthusiasm you enter into full alignment with the outgoing creative principle of the universe, but without identifying with its creations, that is to say, without ego. Where there is no identification, there is no attachment—one of the great sources of suffering.

Eckhart Tolle

from A New Earth: Awakening to Your Life's Purpose