“When you are dealing with an invisible enemy,use most resources as shield, and a bit as a bait.”

“When enter the whole new world, men will deal with new science.To embrace a new science, men need to get used to new wisdom.”

“When you know your enemy is invincible,run and hide, or may do business with him.”

“You looked a little bit smarter when your stupidity lessened a lot.”

“Beware when your enemy's too easily defeated.”

“When you really believe that using sword can kill people,that's when you will be subject to the law of the sword,"those who use the sword will die by the sword.”

“How can you see and sue something invisible?”