I have been corresponding with one of my prisoners now for three months.  I have sent 6 detailed lessons and 2 informal letters.  I also sent one book for his study.  But I have only received 2 letters from him, one being the initial introductory letter reply.  I was hoping for more contact and interest on his part.  Is this normal to only get 2 letters in 3 months of contact?  Or am I hoping fo…