Action refers to an initial behavior or occurance, while reaction is the response of effect resulting from that action.

“A life of reaction is a life of slavery, intellectually and spirritually. One must fight for a life of action, not reaction.” — Rita Mae Brown

“Our reaction to a situation literally has the power to change the situation itself.” — Unknown

“Action and reaction are equal and opposite, and are expressed simultaneously. Sequentially they are repeated in reverse, the reaction becoming the action and the action the reaction.” — Walter Russell

“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.” — Isaac Newton

“Action, reaction, motivation, emotion, all have ...