 The first proof taken from John Duns Scotus is found both in his Ordinatio and De Primo Principio. The argument follows from an initial disjunctive premise: there is either some first uncaused cause or there is not. If the former, Scotus and Wodeham argue that it is obvious that this is God. If the latter is chosen then unacceptable consequences follow. The most notable is that there would be an infinite series of caused causes without a terminating point. Two reasons are offered for why such an infinite series is impossible. The first is that, the whole of all “essentially ordered” causes must have a cause, but if the cause of this multitude comes from the totality of caused causes, then this cause will be the cause of itself, which is impossible. The second reason that an infinite series of causes will not work is this would require that there are an infinite amount of causes acting at the same time. This requirement is built into Wodeham’s (and Scotus’s) conception of essentially ordered causes—which Wodeham later sharply distinguishes from a series of accidentally ordered causes.