Hamlet #7 and #14

Hamlet tells his companions about his "antic disposition" both out of deliberate strategy and natural reaction. The strategy is to try to prove that Claudius is the one who killed his father but at this time he does not know how. The natural reaction comes from the fact that Hamlet feels as though he must avenge his father in some way rather than standing by doing nothing.

 He is saying that the human conscience makes one believe something is either good or bad and if one does something good or bad it may way heavily on the conscience. I do agree with Hamlet's theory because it is only natural for someone to think that every decision they have made is a good one or bad one. 

Hamlet is telling his friends that he is only slightly mad, but not mad enough not to know the difference between a hawk and a handsaw. It is difficult to distinguish whether he is mad or acting, but most of the time we can assume it is just a mixture of both.