who said to every action there is a reaction
Reaction (physics) As described by the third of Newton's laws of motion of classical mechanics, all forces occur in pairs such that if one object exerts a force on another object, then the second object exerts an equal and opposite reaction force on the first.[1][2] The third law is also more generally stated as: "To every action there is always opposed an equal reaction: or the mutual actions of two bodies upon each other are always equal, and directed to contrary parts."[3] The attribution of which of the two forces is the action and which is the reaction is arbitrary. Either of the two can be considered the action, while the other is its associated reaction.
Shooting the messenger The sentiment that one should not shoot the messenger was expressed by Shakespeare in Henry IV, Part 2 (1598)[4] and in Antony and Cleopatra: Cleopatra threatens to treat the messenger's eyes as balls when told Antony has married another, eliciting the response "Gracious madam, I that do bring the news made not the match."[5]