Here is the only known recording of it, from a 1937 BBC radio lecture entitled “Craftsmanship”:
An excerpt on how we live with words:
[Words] are the wildest, freest, most irresponsible, most un-teachable of all things. Of course, you can catch them and sort them and place them in alphabetical order in dictionaries. But words do not live in dictionaries; they live in the mind. If you want proof of this, consider how often in moments of emotion when we most need words we find none. Yet there is the dictionary; there at our disposal are some half-a-million words all in alphabetical order. But can we use them? No, because words do not live in dictionaries, they live in the mind. Look once more at the dictionary. There beyond a doubt lie plays more splendid than Antony and Cleopatra; poems lovelier than the “Ode to a Nightingale“; novels beside which Pride and Prejudice or David Copperfield are the crude bunglings of amateurs. It is only a question of finding the right words and putting them in the right order. But we cannot do it because they do not live in dictionaries; they live in the mind. And how do they live in the mind? Variously and strangely, much as human beings live, ranging hither and thither, falling in love, and mating together.
(Hat tip: Sadie Stein)