"The written word need not be a lie."
- Johnny Rotten
What this means (for me, at least) is that when writing (or making music, or art, etc.) You shouldn't censor or change your work in order to avoid offending people or to make them like you. You need to tell the truth in your creative works so that the world can have that unique viewpoint, be inspired by it, and learn from it
"Fiction is the truth inside the lie."
- Stephen King
It's very similar to the above quote, but stressing the importance of being true even in fictitious works.