Katharine found this great video: http://www.youtube.com/watch?v=6Gt_z72hkH0 -- when I watch it, it makes me want to train wholeheartedly, and yet abandon all hope of results :).
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Had an interesting encounter with "train wholeheartedly" at a Tibetan retreat center. Someone had hung signs throughout the little place where we were sleeping -- "Abandon poisonous foods" on the refrigerator, "Do not wait in ambush" in the hallway and "Train wholeheartedly" on the bathroom mirror. When first arriving, I felt quite peevish about the the signs ("Do not hang signs in ambush" is what I wanted to add). But on the 4th or 5th day, rather unexpectedly, there was a shift in feeling about "Train whole-heartedly" -- I think I finally noticed the whole-heartedly part. It started to mean something like from the heart, allowing the heart to be the center rather than the relying so heavily on the self. It started to sound like joyousness, rather than drudgery.
Train wholeheartedly and abandon all hope for results have started to feel like almost the same slogan. I think there's something tentative about my approach to practice and to life; letting go of hopes for results is a way of releasing certain fears and anxieties so that it is more possible to join in.