"So let me conclude. History has made progress this century, in a lumbering and zig-zag manner, but genuine progress. In saying this I am implying that it belongs to the disciplines to which the word 'progress' can properly apply, that it is possible to arrive at a better understanding of a process which is objective and real, namely the complex, contradictory, but not adventitious, historical development of human societies in the world. I know that there are people who deny this."