Now I take you now to the burden of proof. The burden of proof, as you well know, is on the Crown, and it is on the Crown in respect of every issue in respect of every element of the crime. Well now, before you say you are satisfied for the purposes of a verdict about any issue, you of course have to reach a certain degree of satisfaction in your mind, and what degree of satisfaction must be reached? The answer is that you must be satisfied beyond reasonable doubt, and that is a time-honoured phrase and is usually thought to do very good work in seeing that nobody is convicted of a serious crime unless the court that tries him is satisfied of his guilt beyond reasonable doubt. And you may say, "Well, how do I know when I have got to a stage of being satisfied about something beyond reasonable doubt?" and the answer to that is that it is when you have reached the stage that you either have no doubt at all, because if you have got no doubt at all you must have got rid of all reasonable doubts; or if there is some thing nagging in the back of your mind which makes you hesitate as to whether you are satisfied beyond reasonable doubt, you have got to try and take it out and identify this thing which is causing the hesitation, causing the doubt if you like, and you have a look at it and you try to assess it and you say to yourself is this doubt that is bothering me, does it proceed from reason; is it a rational doubt; is it something which raises a really sensible doubt; or is it a fantastic sort of doubt; is it something which arises from some prejudice that I may have; some quite unreasonable fear that I might go wrong; some perhaps reluctance to make an unpleasant finding. Well, if it is one of those doubts - merely one of those doubts, then of course it cannot be described as reasonable because it does not come from reason; it comes from something which is emotional or irrational or - at any rate it is not based upon reason, and if you have had a look at what is bothering you and you decide that it does proceed from something which is not reason but something fantastic or rising out of prejudice or one of these other things, then you should say to yourself, "The only doubt I've got is one which is not based on reason, I have therefore got rid of all doubts which are not based in reason, and the result of that is that I am satisfied beyond reasonable doubt, because the only things that are worrying me are things which I now assess after looking at them as not based in reason."