answer: #Person1# says people should show mercy and #Person2# thinks sticking to one's principle is another thing.
documents: #Person1#: I understand your feeling. When someone is feeling at loose ends, we may show mercy on him. This is what we call the 'milk of human kindness'. 
  #Person2#: That's right. But feeling sorry for someone is one thing, and sticking to our principles is another. We must make a clear cut between them. 
  #Person1#: You've take the words out of my mouth.