Not a Bad Public ~ Robert Bolt

 Thomas Moore   
~   "Why not be a teacher? You'd be a fine teacher; perhaps a great one."


 Richard Rich      
~    "If I was, who would know it? "


 Thomas Moore  
 ~    "You; your pupils; your friends; God. Not a bad public, that."

More at-   http://en.wikipedia.org/wiki/A_Man_for_All_Seasons