I love this quote from Walden. I have always heard that to reach a goal you had to have a clear vision of the outcome, and I know that's true.
You will surely get lost on a path without a destination.
Don't be afraid to dream big! Build your castle in the sky and then come back and build the foundation and the beautiful staircase up to it. It's a lot easier to hit the target if you know where to aim.
What does your castle look like?