4. The Threshold In Nature and In Man

In this matter we labour under great illusion; we dream, and we cling to our dreams, and will not let them go. I have often spoken of how natural science brings conscientious students to a recognition of the boundaries of knowledge, boundaries man cannot pass without taking his power of cognition into forbidden—nay, into impossible—regions. A very distinguished scientist of modern times has spoken of the “Ignorabimus,” reading into the word a confession that however far we go in the knowledge we acquire from sense-observation and the intellect, we never penetrate to the inner being of Nature. I here touch on a subject that at once lands us in conflict, as was felt even at a time when natural science was far less advanced than it is to-day. It was Albrecht von Haller who expressed the “Ignorabimus” in the well-known lines: