Short Essay Response

I need to write short essay respnse about christian culture after reading "Confessions":  

Friendship is normally seen as something positive and virtuous, but Augustine warns us against its darker side. Explain his reasoning. How does he suggest that we respond to the challenges of friendship?

The rules: 

I need approximately 500 words and no outside sources. 

I will provide the link for the reading. 

I need it before August 14 because the deadline on 8/14/2016 at 8:00 am.