When we say that science is essentially progressive this does not mean that in his quest of truth man follows always the shortest path. Far from it, he beats about the bush, does not find what he is looking for but finds something else, retraces his steps, loses himself in various detours, and finally after many wanderings touches the goal.
The History of Science and the New Humanism, Chapter I (pp. 45-46), H. Holt & Co. 1931