The thing about Hope is, you never know when it is a good thing and when it is not. The line between the two is so thin that we often fail to realize when we have crossed over to the other side.
It is a defense mechanism, hope, against denial. It is like an antibiotic, where dead viruses are injected into the body so that the immune system could easily fight them off and have a good sparring session before the real thing.
But, that is where we go wrong. We place too much trust in Hope. Like the Trojan horse of the Greeks that led to the fall of great city of Troy, Hope sneaks in and opens the gate for an army of other Trojans to creep in, at the dead of night, bringing us down on our knees in the end.