Grist for the mill.
More Traditional Proverbs:
A person who has a right to boast doesn't have to.Traditional
Social good is what brings peace to family and society.
Traditional
The last straw.
Traditional
Those who labor with their minds, rule those who labor with their bodies, are ruled
Traditional
Stubborn as a mule.
Traditional
It's easy to get lost in thought if it's not familiar territory to you.
Traditional