From Ryan Holiday:

As a culture, we love flashes of inspiration and we love finished products. We have little interest and little understanding, however, of what goes on in between—of the essentialness of editing and improving and tweaking until whatever we are creating is just right.

This idea was echoed in his book Perrenial Seller which I thought was great.

Sure, have a flash of inspiration, then back it up with the refining process that is going to make it the work you think it can be.