"For whom" is a question of purpose, "Who to rely on" is a question of method, and "Who am I" is a question of position. Answering the questions of "for whom", "about whom" and "who am I" is a compulsory course for us to deal with practical problems; Solving the problem of "for whom, who to rely on and who I am" is the source of strength for our party to gain the broadest, most reliable and strongest mass base.