He wouldn't change his idea once he's made up his mind. Any to let him change will be in vain.
举一反三
- 中国大学MOOC: He made it quite clear ____ he wouldn’t change his mind.
- He made it quite clear ____ he wouldn’t change his mind. A: what B: that C: whether D: if
- There is no __________ in arguing with him anymore. He will not change his mind.
- It is no use with him on this matter, he will not change his mind.
- We tried ________ vain to make him change his mind.