Ray Bradbury has said:
“I have never listened to anyone who criticized my taste in space travel, sideshows, or gorillas. When this occurs, I pack up my dinosaurs and leave the room.”
“Creativity is a continual surprise.”
“I’m not in control of my muse. My muse does all the work.”
“Write a short story every week. It’s not possible to write 52 bad short stories in a row.”
“Action is hope. There is no hope without action.”
“When I graduated from high school…I couldn’t go to college, so I went to the library three days a week for 10 years.”
“My stories run up and bite me on the leg — I respond by writing down everything that goes on during the bite. When I finish, the idea lets go and runs off.”
“I don’t need an alarm clock. My ideas wake me.”
“Just write every day of your life. Read intensely. Then see what happens. Most of my friends who are put on that diet have very pleasant careers.”
“I don’t believe in being serious about anything. I think life is too serious to be taken seriously.” 
Last but not least is my favorite that I’ve probably posted before, but it’s worth reading again:
“Remember: Plot is no more than footprints left in the snow after your characters have run by on their way to incredible destinations.”
