Here is another quote from Gerald May found on the Aninam Recro blog.
Willingness implies a surrendering of one’s self-separateness, an entering into, an immersion in the deepest processes of life itself. It is a realization that one already is a part of some ultimate cosmic process and it is a commitment to participation in that process. In contrast, willfulness is the setting of oneself apart from the fundamental essence of life in an attempt to master, direct, control, or otherwise manipulate existence. More simply, willingness is saying yes to the mystery of being alive in each moment. Willfulness is saying no, or perhaps more commonly, ‘yes, but…’
But willingness and willfulness do not apply to specific things or situations. They reflect instead the underlying attitude one has toward the wonder of life itself. Willingness notices this wonder and bows in some kind of reverence to it. Willfulness forgets it, ignores it, or at its worse, actively tries to destroy it. Thus willingness can sometimes seem very active and assertive, even aggressive. And willfulness can appear in the guise of passivity. Political revolution is a good example. — Gerald May