“It's right to learn, even from the enemy.”
“Fas est ab hoste doceri.One should learn even from one's enemies.”
“Right it is to be taught even by the enemy.”
“It's much easier, after all, to learn mathematics from someone who's made a few mistakes. It's impossible to learn it from someone who always gets it right.”
“Everything we do is right, even when it's wrong. There's always a lesson to be learned.”
“It is better to learn war early from friends, than late from enemies”