Thou foolish one (aprwn). Old word (a privative, prhn), lack of sense. It is a severe term and justified by the implication "that the objector plumes himself on his acuteness" (Robertson and Plummer). Proleptic position of su (thou) sharpens the point. Sceptics (agnostics) pose as unusually intellectual (the intelligentsia), but the pose does not make one intelligent. Except it die (ean mh apoqanh). Condition of third class, possibility assumed. This is the answer to the "how" question. In plant life death precedes life, death of the seed and then the new plant.