A bad friend is is worse than an enemy, an enemy you can see and avoid, but to detect an insincere friend is hard

Friend: A potential enemy with whom relations have not yet deteriorated to all-out war

Enemy: A friend whose mask has fallen

A bad friend is nothing but a spy

You will know a friendship is not natural when you don't feel relaxed with

Peace is something you only have when your enemy is gone. Either after you have turned him into a friend or vanquished him