"There are no enemies or friends, only teachers."
Nice quote, but it doesn't matter unless you contemplate on it.
Close your eyes, I'll close mine as well, and think of who is your enemy and what have they taught you?
Patience, self preservation? Are they making you tougher, are they making you stand up and say no more?
Now imagine your friends and what have they taught you?
Caring, unconditonal love? Are they making you set someone else first, instead of you, do you go out and "play" even though you feel sad, hence feel better soon? Do you laugh and giggle until your cheeks hurt?
You are someone's friend, and possibly enemy - you are the teacher.
If we are all teachers, what does it mean to you about yourself and the entire planet of people?