Lean on the delete key, says Barbara Kingsolver QUOTE FOR WRITERS

Revision is my favorite work, the part of the process when art really happens. Once you know where you’re going, you can back up and tilt every scene in just the right direction. You can replace every serviceable sentence with one that glows with its own original light. This of course requires an eagerness to throw away a lot of serviceable sentences. Lean on the delete key. It’s frustrating to write a hundred pages you know will not survive, but this is the dirt you have to excavate to get to the vein of gold.
Barbara Kingsolver