Romilly has told us that Diderot was bent on converting him from the error of his religious ways, and with that intention read to him a Conversation with the Marechale de----.[219] It is believed to be an idealised version of a real conversation with Madame de Broglie, and was first printed, almost as soon as written (1777), in the correspondence in which Metra, in imitation of Grimm, informed a circle of foreign subscribers what was going on in Paris. The admirers of Diderot profess to look on this Conversation as one of the most precious pearls in his philosophic casket. It turns upon the conditions of belief and unbelief, represented by the two interlocutors respectively, and is a terse and graphic summary of the rationalistic objections to the creed of the church. The most conspicuous literary passage in it is a parable which has been attributed to Rousseau, but with which Rousseau had really nothing to do, beyond reproducing the spirit of its argument in the ever famous creed of the Savoyard Vicar. [219] _Ib._ ii. 505-528. A young Mexican, tired of his work, was sauntering one day on the seashore. He spied a plank, with one end resting on the land, and the other dipping into the water. He sat down on the plank, and there gazing over the vast space that lay spread out before him, he said to himself: "It is certain that my old grandmother is talking nonsense, with her history of I know not what inhabitants, who, at I know not what time, landed here from I know not where, from some country far beyond our seas. It is against common sense: do I not see the ocean touch the line of the sky? And can I believe, against the evidence of my senses, an old fable of which nobody knows the date, which everybody arranges according to his fancy, and which is only a tissue of absurdities, about which people are ready to tear out one another's eyes." As he was reasoning in this way, the waters rocked him gently on his plank, and he fell asleep. As he slept, the wind rose, the waves carried away the plank on which he was stretched out, and behold our youthful reasoner embarked on a voyage. _La Marechale._--Alas, that is the image of all of us; we are each on our plank; the wind blows, and the flood carries us away. _C._--He was already far from the mainland when he awoke. No one was ever so surprised as our young Mexican, to find himself out on the open sea, and he was mightily surprised, too, when having lost from sight the shore on which he had been idly walking only an instant before, he saw the sea touching the line of the sky on every side. Then he began to suspect that he might have been mistaken, and that, if the wind remained in the same quarter, perhaps he would be borne to that very shore and among those dwellers on it, about whom his grandmother had so often told him.