To My Son

O my son! bend thy head low down, and soften thy voice, and be courteous, and walk in the straight path, and be not foolish. And raise not thy voice when thou laughest for if it were by a loud voice that a house was built, the ass would build many houses every day; and if it were by dint of strength that the plough were driven, the plough would never be removed from under the shoulders of the camels.