Text of the book reads: 

Everything is for the best in this best of all possible worlds if you follow one simple rule...Bank on the Pearl of great price now and always.

"Do not store up for yourselves treasures on earth, where moth and rust destroy, and where thieves break in and steal.  But store up for yourselves treasures in heaven, where moth and rust do not destroy, and where thieves do not break in and steal.  For where your treasure is, there your heart will be also." (Matthew 6: 19-21)
 

Book used: Candide, by Francois Marie Arouet Voltaire, illustrated by Antoni Clave
Sliding tin drawers used as inserts in cut niches

Candide is a naive soul who isn't aware that the world he can see isn't all that there is.  But Voltaire, his creator, was a deist who believed that we were left here on our own to fend for ourselves by a god who simply set the world spinning and then stepped out of the picture.