To a hard knot a hard wedge.
More Spanish Proverbs:
Peter pinches me, and I like it.Spanish
A shoemaker's wife and a smith's mare are always the worst shod.
Spanish
Command your wealth, else that will command you.
Spanish
Never put your thumbs between two grinders.
Spanish
Some day Peter will command as much as his master.
Spanish
My neighbour's goat gives more milk than mine.
Spanish