[33] But the practiser of virtue also wants Billah, that is, swallowing, but as a slave and a concubine; for without food and vitality, living well could not possibly be the lot of the man, since things indifferent are always the foundation of what is better; and he also wants Zilpah, that is to say, interpretation by means of utterance, in order that the rational part itself may, in a twofold manner, contribute to perfection, both from the fountain existing in the intellect, and also from the stream flowing therefrom in the organ of the voice.