Continual dropping wears away a stone. Book I, line 313; comparable to: "The soft droppes of rain perce the hard marble; many strokes overthrow the tallest oaks", John Lyly, Euphues, 1579 (Arber's reprint), p. 81.
In one hand he is carrying a stone, while he shows the bread with the other. Alternate translation: And so he thinks to ‘tice me like a dog, by holding bread in one hand, and a stone, ready to knock my brains out, in the other. Aulularia, Act II, sc. 2, line 18 Cf. Jesus, Matthew 7:9: "Or what man is there of you, whom if his son ask bread, will he give him a stone?"