French: A brain is worth little without a tongue.
Long on hair, short on brains.
If your brain is made of butter, do not be a baker
English: Shut the gate before the horse has bolted—not after.
If the brain sows not corn, it will plant thistles.
Money spent on the brain is never spent in vain.
Albania: Mind the goats so that you will drink their milk.
German: You don’t see the brain on one’s forehead.
Arabic: Arrogance over the arrogant is modesty.
Corsica: An idle person is up to no good.