Before I begin to speak about my subject proper let me make a few introductory remarks. I feel I shall have great difficulties in communicating my thoughts to you and I think some of them may be diminished by mentioning them to you beforehand. The first one, which almost I need not mention, is, that English is not my native tongue and my expression therefore often lacks that precision and subtilty which would be desirable if one talks about a difficult subject. All I can do is to ask you to make my task easier by trying to get at my meaning inspite of the faults which I will constantly be committing against the English grammar. The second difficulty I will mention is this, that probably many of you come up to this lecture of mine with slightly wrong expectations. And to set you right in this point I will say a few words about the reason for choosing the subject I have chosen: When your former secretary honoured me by asking me to read a paper to your society, my first thought was that I would certainly do it and my second thought was that if I was to have the opportunity to speak to you I should speak about something which I am keen on communicating to you and that I should not misuse this opportunity to give you a lecture about, say, logic. I call this a misuse for to explain a scientific matter to you it would need a course of lectures and not an hour's paper. An other alternative would have been to give you what's called a popular-scientific lecture, that is a lecture intended to make you believe that you understand a thing which actually you don't understand, and to gratify what I believe to be one of the lowest desires of modern people, namely the superficial curiosity about the latest discoveries of science. I rejected these alternatives and decided to talk to you about a subject which seems to me to be of general importance, hoping that it may help to clear up your thoughts about this subject (even if you should
2)
entirely disagree with what I will say about it). My third and last difficulty is one which, in fact, adheres to most lengthy philosophical lectures and it is this, that the hearer is incapable of seeing both the road he is led and the goal which it leads to. That is to say: he either thinks: “I understand all he says, but what on earth is he driving at” or else he thinks “I see what he's driving at, but how on earth is he going to get there”. All I can do is again to ask you to be patient and to hope that in the end you may see both the way and where it leads to. ‒ ‒ ‒