弗洛伊德把人的发展分为“本我”、“自我”和“超我”三个层次，“本我”即动物的人，“自我”即有自我意识的人，“超我”即有高尚境界的人。“本我”的人终身浑浑噩噩，无所事事，如同牲畜，不知一生之所事；“自我”的人，有自我意识，个性明显，确立了自己的奋斗目标；“ Freud divided human development into three levels: “self”, “self” and “super self”, “self” as animal, “self” as self-conscious person, That is, there are noble people. The people of “self” are unexamined for life, doing nothing, like livestock, and do not know the things of one ’s life. Those who are “self” have self - consciousness and obvious personality and set themselves the goal of their struggle.