As to “properly understand”, the sense of this phrase in the groves of academe [with its perhaps marked ‘politesse’ and deference to relevant authorities] may be rather different than in the legal world – though here a more commonly used phrase might be “proper understanding”, as in the “proper understanding or correct interpretation…” of the relevant wording. It may be understandable that someone somewhere is put more than on their mettle that a “key tenet”, which they do not accept as part of a text they have long studied, is claimed to be essential for a proper understanding of that text. Such a claim might even provoke an adverse emotional reaction. But the highest courts are now usually more philosophical about this sort of thing, and tend not to withdraw from further discussion simply because a claim of this provocative character is made. Perhaps an example then: at the end of the nineteenth century ‘Denman’s Act’ was enacted in England to give an accused the right to testify in their own defence [incredible as it may seem, prior to this point they were prohibited from doing so – even in a case of self-defence]. Along with this new right came provisions as to the circumstances in which the credibility of an accused who testified could be challenged, for example by adducing their previous convictions. Within the next decade or so, the equivalent of the modern Supreme Court [then known as the House of Lords] made several momentous decisions on the proper understanding of these provisions; and, in the wake of these landmark decisions, many further cases addressing further points were decided in ensuing decades. About seventy years after the original legislation, another case on these provisions reached the House of Lords [as was]. This was legislation which the House of Lords had by then studied and indeed ruled on for that time, being the highest legal authority on such matters in the realm as regards its “proper understanding”, and on which inferior courts had also made rulings - none of which deviated from the House of Lords’ rulings. Despite this, the lawyer presenting this appeal dared to suggest that the understanding of the provisions adopted back at the beginning of the century was not the correct or proper understanding. The lawyer had no legal authority for this daring suggestion of course, certainly not in the form of case law, as all the decisions of the House of Lords itself were against him and so were those of inferior courts. But while acknowledging this lack of legal authority, nevertheless the lawyer focused closely on the wording of the provisions themselves and what the lawyer then argued was a better construction [or “proper understanding”] of their effect. The lawyer was emboldened to present this novel argument by a recent decision of the House of Lords itself, in which the House of Lords [perhaps having been swung by a thorough-going ‘fallibilism’ of Popper’s sort] reversed the law that held no House of Lords’ decision could be overturned, even by a subsequent decision of the House of Lords. The lawyer was in effect asking the House of Lords to overrule its previous decisions many years before by looking again at the wording of the provisions and their correct or "proper" interpretation. Far from dismissing this novel argument ‘out of court’, the House of Lords carefully considered it, and tested it by question and counter-argument. After much courtroom debate, the House of Lords gave their decision. Their Lordships began by expressing the view that this novel construction was more logical and indeed had more merit - in every respect save one - than the construction that had been adopted many years ago. [While suggesting that part of the problem was simply that no one had canvassed such a construction before]. Their Lordships even expressed the view that, had anyone argued this new construction all those years ago, it would have prevailed. If it had then prevailed, the whole course of the development of the law would likely have been changed, perhaps even fundamentally, and perhaps for the better [certainly some problematic detours might have been avoided]. The practical problem was that the lawyer was in effect saying there were firmer, better foundations for the “proper understanding” of the legislation than those laid down years ago: but while that may well be so, putting those new, better foundations in place would involve tearing down the whole edifice which had been gradually erected on the old foundations. Whatever the greater merits of the new construction, for this reason alone it was too late in the day to adopt it. We might note here the ‘philosophical’ character of House of Lords' response to this challenge to its own decisions, as well as the fallibilism inherent in its 1965 'decision' that it could overrule or depart from its own previous decisions. But in adopting the practical reason it did for dismissing the new construction, the House of Lords was using a kind of practical consideration that cannot generally avail anyone who refuses to countenance an interpretation of a text that differs from their own view, no matter how long-held and perhaps even cherished. Public confidence is at the forefront of the considerations taken into account by the House of Lords, and the cut and thrust of argument is the lifeblood of deciding on the merits in the legal field. It would hardly enhance public confidence in those entrusted with deciding the most important points of law, if such a body were to withdraw from further discussion at any suggestion that its previously held views may not have reflected a correct or “proper understanding” of the legal text under consideration. Donal May the Lord have mercy on my soul Salop