unforeseen

Men wiser and more learned than I have discerned in historya plot, a rhythm, a predetermined pattern. Those harmonies are concealed from me. I can see only one emergency following upon another, as wave follows upon wave; only one real fact with respect to which, since it is unique, there can be no generalizations.Only one safe rule for the historian: that he should recognize in the development of human destinies the play of the contingent and the unforeseen.

—Fisher, H(erbert) A(lbert) L(aurens)