What is the difference between a plan and a dream?

““Enough of your grand dreams, dearest.”

“Plans, not dreams.”

“Don’t plan too elaborately. Things never work out as planned.”

“That’s why I just keep the goal in mind. I can always change the plans.””

L. E. Modesitt Jr., Antiagon Fire

I think the difference between a plan and a dream is that with a plan you know what your first steps are to reach your dream. The dream is where you want to be and the plan is how to get there. Remember this when you realise you are off course, so that you change your plans and not your dreams.