I have found nothing to alter either in the propositions themselves or in their grounds of proof, or in the form and completeness of the book's plan; this is to be ascribed partly to the long period of scrutiny to which I subjected them prior to laying it before the public; and partly to the constitution of the matter itself, namely to the nature of a pure speculative reason, which contains a truly articulated structure of members in which each thing is an organ, that is, in which everything is for the sake of each member, and each individual member is for the sake of all, so that even the least frailty, whether it be a mistake (an error) or a lack, must inevitably betray itself in its use.