A leopard can't change its spots
ʃase lə natyʁɛl il ʁəvjɛ̃t o ɡalo
In French Chassez le naturel, il revient au galop.
This French idiom means 'You can't change your true nature' and is used to describe someone's inherent traits.
Example
"Il a essayé de changer, mais chassez le naturel, il revient au galop."
