Imagine a big block of marble.
You’re the sculptor.
With a chisel and a mallet you start your work.
After months of toil, you don’t have much to show for your efforts. You’re disheartened. You question if the vision is attainable or simply a naive dream.
You look at the big block of marble again. This time with conviction. You realise then that the statue is already there.
You pick up your tools, you do the work, you chip away, you follow your plan, and eventually, you reveal what’s in your minds eye.