Any kind of expectation creates a problem. We should accept, but not expect. Whatever comes, accept it. Whatever goes, accept it. The immediate benefit is that your mind is always peaceful.
[O]ur own bodies are changing every second. Yet we take the body to be our Self; and, speaking in terms of it, we say, I am hungry or I am lame; I am black or I am white. These are all just the conditions of the body. We touch the truth when we say, My body aches, implying the body belongs to us and that therefore we are not that. (87)
The same thing can be both good and bad. Whenever you speak of good, bad is also present. The world is a mixture of both. There is not good without bad. They are both sides of the same coin. Both are necessary. We have been given free will and discriminating capacity to select what is beneficial to us and to avoid what is detrimental to us. Even Cobra poison can be used as medicine.