In batman begins ducard says a quote about ninjitsu and i would like to know wat it means?

he was trying to teach him a valuable lesson. He wanted bruc to think exponentally not linear. would it be better to charge a whole army by yourself or to find ways to trick them and make them do what you want them to do in regards to the fight. thats the way a ninja would handle a situation like that. He wanted him to understand the basis of ninja. as for the great number, it wouldn't even matter. if it was 6 or 600 hundered, no matter what the situation, he would have the tools to overcome the situation and defeat his enemies. thats the way of the ninja.