“Being on a journey” is an eternal subject facing the Communist Party of China （CPC）. In essence， the “Three Musts” answer the major practical question of what kind of state our Party “should take in the journey” on the new road toward the goal. From the perspective of “new journey”， the “Three Musts” have their own internal generation logic， that is， they originate from the concept of “Being on a journey” by Marxist classical writers， they are based on the centennial practice of “going on a journey” of the CPC， and are due to the new challenges faced by the Party on their “journey” in the new era toward new goal. The “Three Musts” profoundly answered， from three dimensions， the questions of “to embark on a journey”， “where we should start from”， “where we should go”， “what tradition to inherit”， “what style to work with”， “with what kind of mind” and “what abilities to master”， which is an organic whole with rich connotation and strict logic. To embark on a new journey， we should accurately grasp the “Three Musts” and enhance the historical initiative of “going on a journey”； always keep in mind the “Three Musts” and always keep the sober and firm attitude； strictly implement the “Three Musts” and fulfill the mission of “going on a journey”.