The context I am writing in is along the lines of: When we can identify and appreciate our emotions, we are able to carefully engage both emotion and cognition in the decision making process which makes it a "very valuable" destination point when we are able to get to that stage.
I'd like to use an idiom to describe this "very valuable destination point", the best I've come up with so far is discovering a gold mine:
When you are able to use your knowledge to transform your feelings into a positive and productive force, you will have found a gold mine.
Is there a more common idiom that would work here? Is there one that would fit better within the context of emotions?