It's also a central principle of many beliefs. It's common for a person to think that they are smarter than gods or that they know all the facts of the universe and what is right and wrong and then they judge the things around them based on their little ideas.

God works in mysterious ways is a thing that a humble (realistic) person should keep in mind. A Human is a tiny insignificant creature and a human brain isn't going to comprehend the reasons, events and magnitude of things. We don't even know anything about the past except the stories we've heard and made up. Let alone the future.

Whether you believe in deity or not, it is a good model and perspective. A piece of age old wisdom, even if you don't like the words it had been put in.