You can be a stubborn donkey, but you can't be a difficult pig.

"You can be a stubborn donkey, but you can't be a difficult pig." This sentence means that a person can be stubborn and stubborn, but don't be so stubborn as to lose flexibility and adaptability.

"Stubborn donkey" means that a person is very stubborn and stubborn, which is similar to "stubborn as a donkey", indicating that it is difficult for a person to be persuaded and firmly adhere to his own views and positions.

"It is difficult to invite pigs" is a metaphor, which refers to people who are not easily invited or pleased. They are unwilling to accept advice or help from others, or unwilling to change their thoughts or behaviors.

Taken together, this sentence means that a person can have his own persistence and position, but not too stubborn and stubborn. He should be flexible and adaptable, and accept suggestions and help from others in order to achieve better results.