The son of an ass brays twice a day.
More Spanish Proverbs:
He that does not lie, does not come of good blood.Spanish
He that will not when he may, when he will he shall have nay.
Spanish
When an old man cannot drink, prepare his grave.
Spanish
The first duty of a soldier is obedience.
Spanish
Do not talk Arabic in the house of a Moor.
Spanish
By the thread we unwind the skein.
Spanish