You need a number of points to convince your reader. In other words, consider why you think your thesis is correct. Here are some ideas.
You can say that the world constantly changes. Sometimes the world and a person's surroundings may change for the worse. When this happens, what should a good person do? He or she should have a good inner voice to do the right thing. But if a person does not have an inner life, then he or she cannot do the right thing. Here is a concrete example. Think of the novel To Kill a Mockingbird. Atticus was able to defend Tom Robinson, because he was not a slave to his surroundings. He had inner convictions and a moral compass that said that all men are created equal.
I think you get the picture. Think of a few more arguments. The stronger they are, the better your essay will be.
It is a strange and interesting topic at the same time. Each person must have a distinctive personality that makes him different from others. If you live without any inner feelings ,so you will be as a slave because you will follow what others do whether it is good or bad. You may destroy your life because not all people do the good things. One day, you will wake up and ask your self what is my goal? Is it other's goal?. Each person must have his own identity and dreams then he tries to fulfill his dreams.
The word slave means a person who obeys what his master says and he does not have the right to refuse ,but we have a BRAIN that distinguishes between good and bad things. Moreover, you can write about the consequences of being as a slave. Finally, you must provide the solution that each of us must has his special personality and identity to be a successful member in the community.