I really liked the post Twelve Things You Were Not Taught in School About Creative Thinking on Psychology Today, especially this part:
9. There is no such thing as failure. Whenever you try to do something and do not succeed, you do not fail. You have learned something that does not work. Always ask “What have I learned about what doesn’t work?”, “Can this explain something that I didn’t set out to explain?”, and “What have I discovered that I didn’t set out to discover?” Whenever someone tells you that they have never made a mistake, you are talking to someone who has never tried anything new.
And #10 You do not see things as they are; you see them as you are. This goes along with there is nothing original but no one else sees things as you do.
Finally, #13 (did they not notice there are 13 points in this article?):
And, finally, Creativity is paradoxical. To create, a person must have knowledge but forget the knowledge, must see unexpected connections in things but not have a mental disorder, must work hard but spend time doing nothing as information incubates, must create many ideas yet most of them are useless, must look at the same thing as everyone else, yet see something different, must desire success but embrace failure, must be persistent but not stubborn, and must listen to experts but know how to disregard them.