I don't remember the context in Dune. But I read it to be about irrational fear of something that is not life threatening. Obviously "overcoming your fear" by

I don't remember the context in Dune. But I read it to be about irrational fear of something that is not life threatening. Obviously "overcoming your fear" by putting your life in danger in a situation where you are almost certain to be killed or injured is probably not an idea most people can seriously claim to live by.