We can apply this to almost every situation in which we find ourselves. For instance, when a relationship comes under pressure, your significant other may appear to be the enemy, but he/she is truly your friend. The relationship dynamic is also your friend.
The relationship problem is as much about your as it is about your partner. Whilst you may hate the challenges presented by the relationship dynamic, it is those very challenges which evoke you to be your very best, to learn once again to connect and communicate, to learn to love and care and nurture, all the finest qualities of humanity. The relationship challenges invite you to rediscover your humanity and loveability, and in that sense the enemy is actually your friend.
Let that which challenges you also support and grow you.