I agree with the statement "No one can be authentically human while he prevents others from being so". In the reading Friere talks about how the oppressors always try to isolate the oppress and enslave mentally and physically. Taking away a person human rights and isolating them so they are treated non-human. The first part say "No one can be authentically human", what I think they mean is that you cannot present yourself as human if you say so. Then the other part say that "while he prevents others from being so". What this mean is if you isolating humans to success from becoming human then you cannot call yourself human because of what you doing. You are being the oppressor and enforcing enslavement to other human beings. So in order to call yourself human you have to make the changes and stop the oppressors from oppressing human being. If you do this then only you can really call yourself human because of the positive change you made.