You seek wool from a donkey!
More Latin Proverbs:
In prosperity you may count on many friends; if the sky becomes overcast you will be alone.Latin
What you've never had you never miss.
Latin
You keep making that face and it'll stay that way.
Latin
A wealthy man can err with impunity.
Latin
Let not your right hand know what your left hand doeth.
Latin
Quietly, if you can; if not, by any means.
Latin