PARADOX

Snake: Techniques, sure. But what about how to think like a soldier?

Boss: How to think like a soldier? I can't teach you that. A soldier needs to 
be strong in spirit, body, and technique - and the only thing you can learn 
from someone else is technique. In fact, technique doesn't even matter. What's 
most important is spirit. Spirit and body are like two sides of a single coin. 
They're the same thing. I can't teach you how to think. You'll just have to 
figure it out for yourself. Listen to me, Jack. Just because soldiers are on 
the same side right now doesn't mean they always will be. Having personal 
feelings about your comrades is one the worst sins you can commit. Politics 
determine who you face on the battlefield. And politics are a living thing. 
They change along with the times. Yesterday's good might be tomorrow's evil.

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其实算Boss的独白，这个女人的见解很有深度，所以后来她叛变也是可预见的。

很有哲理的话语，不仅适用于战士，适用于所有人。