the fourth is wisdom of the ages

I'm not sure that's true. In the pre-Freud examples I can think of, dreams were interpreted as predicting actual future events. (Think Joseph interpreting Pharaoh's dream, or the portentious dreams in Shakespeares's Julius Caesar, or lots of folk methods for dreaming about a future spouse.) Freud's claim that dreaming about a crop failure meant something about your fears or emotions, rather than actual future weather conditions, was a new idea.