Don't say your education, high quality, and the people are very generous, it is one-sided, actually everyone will have the stubborn, and once stubborn side will be hard to shift.

不要说自己受过教育、素质高、对人很宽厚，那只是片面的表象，实际上每个人都会有固执的一面，而且一旦固执起来会很难改变。

youdao

She had such a stubborn attitude that once she was determined to do something, no one could find proper words to persuade her to change her mind.

她持如此固执的态度以致交通费坚持要求固执的态度一旦她下定决心做某事，就没人能找到合适的话语说服她改变主意。

youdao

Her grandfather is a very stubborn person. Once he makes a decision, nobody can change it.

她的祖父是个顽固分子。一旦他决定了的事情，没有人能够改变它。

youdao

Once upon a time there was a stubborn child who never did what his mother told him to do.

NEWYORKER: Once Upon a Time

The stubborn persistence of anti-vaxxers shows how difficult it is to dispel misinformation once that information is out there, even after dozens of new studies and millions of dollars in research that demonstrate that vaccines are safe.

FORBES: Should Doctors Fire Their Anti-Vaccine Patients?