Need help to locate source of Chesterton and Picasso quotes

[pjalne]

Don't know if this is the right forum, but here goes.

I'm writing a paper on movies as contemporary mythology, and want to use the Chesterton quote "Fairy tales are more than true. Not because they tell us that dragons exist, but because they tell us that dragons can be defeated." Problem is, I need a book and a page number. Does anyone here have any idea? The same goes for Picassos "Art is a lie that makes us realise the truth."