357 It is this great difficulty involved in consistency which is responsiblefor the fact that however much we may try or desire to do otherwise,the best man to run a system effectively is he who has devised it,''^for however careful and painstaking we may be in trying to repro-duce his system accurately on paper, these reproductions are merelyabstracts of the original ; reproduction can never be absolutelycomplete. We may reproduce a system on paper in clearly markedoutlines, we may add within the general configuration all the inter-woven details, all of which may be concise and manageable, butbeyond the confines of the system there are blank margins in alldirections, which cannot be filled in until such cases arise as willcompel us to extend the ramifications of our system into thesemargins. It is not possible to express these ramifications before-hand on paper, but they no doubt have been allowed for in themind of the originator of the system, even supposing that he is notalways conscious of it. It is precisely these undefined marginswhich in most cases put consistency on its trial ; hence consistency,already a difficult factor in cases where the deviser deals with hisown system, is doubly so in other cases, for the unexpressed rami-fications which remain in suspense until called into being by unfore-seen circumstances can only be depicted consistently with therest of the system in the mind of the originator, who will have tobe consulted in each case for the purpose.
What great advice this is in general, but especially for those who are attempting to copy or recreate Niklas Luhmann's zettelkasten for themselves.