 No one disagrees that all men can know the truth, and even the least enlightened of philosophers agree that man participates in a certain Reason that they do not determine …. I see, for example, that twice two is four, and that my friend is to be valued more than my dog; and I am certain that no one in the world does not see this as well as I…. There must, therefore, be a universal Reason that enlightens me and all other intelligences. For if the reason I consult were not the same that answers the Chinese, it is clear that I could not be as certain as I am that the Chinese see the same truths as I do. (Elucidation 10, OC 3:129; LO 613)