from Against the Stream
If your spiritual practice is all pleasant all of the time, you are probably not doing it right. And it may be that very few people have the kind of commitment to go through a heart-wrenching, dark-night-of-the-soul type of experience. Again, that's probably why the Buddha described this path as leading against the stream.
I believe that Soren Kierkegaard remarked that if you are comfortable with Christ then you probably don't know him. And isn't it interesting to see Carmelite terminology in a Buddhist book? Does it not suggest something about the truth being taught? Shouldn't we be open to the truth wherever it comes from? And when it comes from many different places at once, how much more so?