Keller's Every Good Endeavor - Chapter Two

I'll be facilitating a discussion on chapter two (pages 44-53) of Keller's work Monday evening. Here are some questions I've pulled together for discussion.

1. It has been said that we (humans) were created for worship, or even fellowship, but Keller says that we are created for work (48).
   
   Which is it? Or are there even better answers?
    
   
2. Keller states that "the material world matters" (51).
   
   How do we know that the material world matters?  
   
   
3. Keller asserts that manual labor has no less dignity than knowledge work, and he goes on to say "that secular work has no less dignity and nobility than the sacred work of ministry.
   
   Do we believe that? Do we act like we believe that? What in our behavior might betray such a belief?