Give the grateful man more than he asks for.
More Spanish Proverbs:
If love be timid it is not true.Spanish
He who knows nothing is as blind as him who cannot see.
Spanish
Beauty and chastity are always quarreling.
Spanish
Don't sign a paper without reading it, or drink water without seeing it.
Spanish
Never ask of him who has, but of him you know wishes you well.
Spanish
He that eats the king's geese shall be choked with the feathers.
Spanish