He who greases his cart-wheels helps his oxen.
More Spanish Proverbs:
Large thongs of another man's leather.Spanish
Let it be a husband, though it be but a log.
Spanish
A spot shows most on the finest cloth.
Spanish
God will provide, but a good bundle of straw will not be amiss.
Spanish
Two boys are half a boy, and three boys are no boy at all.
Spanish
One grievance borne, another follows.
Spanish