I have found the first Harry Potter book for free in Esperanto: http://vk.com/doc-32862458_32140010?dl=9899f1eb363a907886
I reccomend that you read the book first in your own language and then in Esperanto. I have already learned English this way.
So maybe this book contains the language of hope and is written in the language of hope Esperanta, about speaking in hope of good things. By one who hopes. Maybe also it's in a color that restores the soul green like the flag or green pastures and the white something pure because hope is pure and a good thing. : )