have the courage of your convictions
US /hæv ðə ˈkɜːrɪdʒ əv jʊər kənˈvɪkʃənz/
UK /hæv ðə ˈkɜːrɪdʒ əv jʊər kənˈvɪkʃənz/

1.
to be brave enough to do what you feel is right and to not be afraid to express your beliefs, even if others disagree
:
•
It's important to have the courage of your convictions, especially when facing peer pressure.
•
She always has the courage of her convictions, even when it means standing alone.