This  idiomatic expression is  demonstrate my  conception of the world. It`s only my opinion.  It's   no importance  in your profession. You can be a teacher or a writer. To be passive or  active. It is your choice , agree or disagree with me .  But everyday people use psychical  mechanisms. There are  memory, attention, logic.  Logical means capable of, or reflecting the capability for correct or valid reasoning.  

          Reasons to why things happen will get you from  A to Z. Basically like saying, "I am hungry  now because I didn`t eat a long time  " The cause is that I'm hungry , the effect of that i didn`t eat  7 or 10 hours .  I'm only using this to show an example.  The imagination will take you everywhere means. If you imagine things to happen or whatever you're basically predicting or assuming things or wondering if things will work out.   What it comes down to is that your imagination speaks bigger than what really happens. In reality logic is more realistic and better in the world, whereas imagination is something you can try to create, but doesn't mean it will always work. It's sort of like a guess in a way.      

        Imagination doesn't always work, especially in terms of people unless they follow exactly what you say or do and even then will people follow exactly what they have to do?    No, why? Because we're all different and unique people. We aren't robots or identical humans. What makes us people is differences and we all learn from each other in life. Following a strict set of rules or paths will not create a better life for us all.