states - Anything that can go wrong, will go wrong.
Murphy did not come up with this. It was attributed to him.
Either way, this is a pessimist's way of looking at life.
If fear dominates you, you think about the things that will go wrong and what you keep thinking about, often comes to pass.
If faith/belief dominates you, you think about the things you want to achieve and they come to pass.
What have you been thinking about?