I read this the other day and found it very apt: “If you have built castles in the air, your work need not be lost. That is where they should be. Now put the foundation under them.” – Henry David Thoreau
Maybe it's a bit too verbose really to fit Miguel de Cervantes' observation: “An aphorism is a short sentence based on long experience”, but that doesn't lessen its value as food for thought.
There is nothing wrong with dreaming, as long as you don't stop at dreaming but strive to make the dreams come true -- that's what I've made out of it. Any more ideas?