Every rose has its thorn

Jo? Look at me. I’m about to do something really f**king stupid. When I do this, I need you to remember three words for me. Omni rosae spina.” Thorn
“Every rose has its thorn?” Jo
“Good, you understand Latin. Yes. Commit those words to memory in the event I lose control. Okay?” Thorn

Flowers of all hue, and without thorn the rose.

A thorn defends the rose, harming only those who would steal the blossom.

A rose is a rose is a rose

Democratic, market-oriented Taiwan is a thorn in its side.