Darynda Jones said this quote

Real writers write. Period. No, the muse does not come to visit everyday. She’s a lazy, precocious flirt. You cannot get into the habit of being “in the mood” to write. No writer on Earth is in the mood to write everyday, but the good ones do it anyway. They fight through their fatigue, their stress, their doubt, and they write. They get the words on the page. Period. So stop waiting for your muse. Trust me, she sleeps around.