“A man can be destroyed but not defeated”
士可殺不可辱。
得人心者得天下,失人心者失天下。
The one who wins people's sympathy wins the world, and
vice versa.
“You can catch more flies with honey than you can with vinegar”
If she doesnot agree with you, you might explain that it is for her safety rather to fight with her, as you can catch more flies with honey than (you can)with vinegar.