[130] [cap.38] And of what kind they are, he proceeds to [114] [115] [116] show in a few words, deriving his explanation from the natural things of art; for he introduces Agar as filling a leathern bag with water, and giving her child drink. [117] Now Agar is the handmaid of Sarah, the new dispensation of perfect virtue; and she is correctly represented so. Since, therefore, having come to the depth of knowledge, which Moses here calls a well, she draws up (filling the soul as if it were a vessel) the doctrines and speculations which she is in pursuit of, wishing to feed her child on the things on which she herself is fed.