Dogen also said, 

During the time of the the first emperor of Shin, the crown prince wanted to enlarge his flower garden.  A minister said, “Wonderful! If you enlarge the flower garden and many birds and animals gather there, we will be able to defend our country against the troops of the neighboring country with the birds and animals.”   Because of this remark, the crown prince gave up the project.  

At another time, the prince wanted to build a palace with lacquered pillars. A minister said, “It really should be done. If you lacquer the pillars, the enemy will not invade.” So, this was also stopped.  

The essence of Confucianism is to stop doing wrong and encourage doing good by using skillful words. Monks also should have this kind of skillfulness when teaching others.