To give too much when little is asked is a form of refusal.
More Spanish Proverbs:
Yesterday a cowherd, to-day a cavalier.Spanish
The thorn comes into the world point foremost.
Spanish
What is not yours always chirps for its master.
Spanish
Of evils, the least.
Spanish
In a smith's house the knife is wooden.
Spanish
The cross on his breast, and the devil in his heart.
Spanish