Discourse of Port de Set with P. & Mr. [blank] at Petit Paris, & the teaching biding to cheat the Hugenots: Nulla fides servanda cum Hereticis, nisi satis validi sunt ad se defendendos [faith need not be kept with heretics].
Journal entry (25 January 1676), quoted in John Lough (ed.), Locke's Travels in France 1675-1679 (Cambridge University Press, 1953), p. 20.