What episode did Qianlong tell Ji Xiaolan about the emperor's art?

What Qianlong told Ji Xiaolan about the emperor's skill is the 29th episode. Ganlong told Ji Xiaolan that the imperial art and the imperial book were powerless. Gan Long thought the proposal of the small Shenyang toll bank was good, so he said something to Ji Xiaolan, saying that some things can't be done until you know that you are good, and some things can't be tolerated until you know that you are bad. Ji Xiaolan also recognized the meaning of this sentence.