Hi. Unfortunately you didn't show the lines for which you need to know the central idea. This makes it impossible for your question to be answered. However, I will try to help you as best I can.
By searching for your question on the internet, I was able to access the article you are referring to. In general, we can state that the central idea of this article is to show how Freud researched and presented how the human mind and the behaviors that human beings have are managed and influenced by the components of the subconscious, which are known as ID, Ego, and Superego.
It is possible to recognize the central idea of a text, identifying the main subject that this text wants to present. In this case, in order for you to discover the core idea of the lines your question refers to, you will need to read those lines and find out the main subject they are addressing. This subject will be directly related to the central idea of the complete text, presented in the paragraph above, since the entire text must be coherent and address related subjects.