opened to an unexpected page:

Now there are many, many people in the world, but relatively few with whom we interact, and even fewer who cause us problems. So when you come across such a chance for practicing patience and tolerance, you should treat it with gratitude. It is rare. Just as having unexpectedly found a treasure in your own house, you should be happy and grateful towards your enemy for providing that precious opportunity. Because if you are ever to be successful in your practice of patience and tolerance, which are critical factors in counteracting negative emotions, it is due to the combination of your own efforts and also the opportunity provided by your enemy.

--HH Dalai Lama, The Art of Happiness