The stranger is an element of the group itself, not unlike the poor and sundry 'inner enemies'—an element whose membership within the group involves both being outside it and confronting it.

剑鞘保护剑的锋利，自己却满足於它自己的迟钝。

我喜欢把自己看作一个恰好会唱歌的普通人。

"The strongest chains are made of fear, not steel."

I don't count my sit-ups. I only start counting when it starts hurting.