When we hope for a particular outcome, we are wanting to control something outside ourselves. We set ourselves up for disappointment if it doesn't come to pass as we want it to; and if it does we enjoy the results of that instance, but happiness from this source is fleeting and not controlled as it may seem, which will eventually lead to the disappointment option.
Attachment to an outcome is a form of judgment. If this thing happens, it will be good, but if that one happens it's bad. On the other hand, if we accept things as they are in advance, we're free from the anxiety of waiting for the future to bring us the good or the bad. We will respond as best we can to the gifts and challenges that come. We're in this moment, in acceptance.