The following insight comes from Tibetan Buddhist teacher Chögyam Trungpa Rinpoche in his book Cutting Through Spiritual Materialism:
We must surrender our hopes and expectations, as well as our fears, and march directly into disappointment, work with disappointment, go into it and make it our way of life…. If we can open, then we suddenly begin to see that our expectations are irrelevant compared with the reality of the situations we are facing. This automatically brings disappointment. Disappointment is the best chariot to use on the path of the dharma. It does not confirm the existence of our ego and its dreams.
This, along with hundreds of other interesting quotes from Tibetan Buddhist teachers, can be found in Reginald A. Ray’s The Pocket Tibetan Buddhism Reader, a shirt-pocket-sized paperback from Shambala.