Enemies

I wonder why we hate someone and have them as our enemies. Is this because they don't treat us well? Is this because they don't show their love for us? Is this because they made faults? Is this because we just don't like them to be our friends or to know them? Or is this because we're just not interested in them? Just keep on thinking if what's really the reason. For me, when I reflected on this statement, I really realized that our enemies are the ones who will help us when we're in trouble, when we're struggle in times of difficulties, or when we're in danger. "The best friend of enemy is closeness." I believe in this quote, because I've already experienced this. I didn't expect that this quote is true, but in the end, I believed in it.