Here is my favorite Sun Tsu quote:

“If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle.”

I'm not sure how this actually makes sense in the context of war. It doesn't seem like knowing your enemy and knowing yourself should actually make you invincible in war. Besides, what if your enemy also knows themselves and knows you?

But it makes perfect sense in the context of a debate. Replace "know yourself" with "know the argument for your side". Then replace "know the enemy" with "know the arguments for the other side". Assuming you know both sides and defend the side you honestly believe in, it does seem like you should be invincible in debate. All you have to do is communicate the arguments, and people should agree with you. (It's more complicated than that, but at least it makes more sense than the version about war.)

That leads into this next quote:

“Victorious warriors win first and then go to war, while defeated warriors go to war first and then seek to win”

In a debate, you should not try to win by getting better at debating. It's more effective to win by first knowing both sides, and then picking the winning side.

How do you know you know both sides? With an Ideological Turing Test, of course:

“To know your Enemy, you must become your Enemy.”