Unclean Lips – Sermon Preached on 31st May 2026 (Trinity Sunday)

Preached at All Saints’, All Cannings (Devizes Deanery Choral Evensong)

Isaiah 6.1–8; John 16.5–15

“Woe is me! … because I am a man of unclean lips, and I dwell in the midst of a people of unclean lips!”

Starting in 1972, the animal psychologist Francine Patterson began to teach an infant gorilla named Koko a modified form of American Sign Language. Patterson claimed Koko could sign a thousand words and understand twice that number in English. I remember seeing Koko speaking on children’s programmes when I was a kid, where we were told that this was absolutely the case (and some people still claim that is so).

Other researchers, however, found that while Koko could indeed use signs to request food, play, or affection, her handlers were, to a large extent, seeing what they wanted to see and ignoring the many times that Koko signed arrant nonsense in search of a reward. Koko could only use signs in a simple, isolated way, with no evidence of the complex, rule-based sentences that even young human children use.

Koko’s life was not in vain, however. She transformed public attitudes to gorillas, previously seen only as dangerous and brutish, just as their habitats were coming under terrible pressure and needed protection. She died eight years ago at the ripe old age – for a gorilla – of forty-six.

Those with longer memories recalled a horse in early 20th Century Germany nicknamed Clever Hans, whose owner, Wilhelm von Osten, claimed that he could not only spell words by pointing his hoof at a blackboard, but could also tell the time and even do arithmetic well enough to work with fractions. Unfortunately, when von Osten died, nobody else could get Hans to multiply fractions, and the poor creature had a miserable end, drafted into the First World War as a warhorse, where he was either killed in action or, perhaps, consumed by hungry soldiers.

A black-and-white photograph, apparently from the early twentieth century, showing two men and a horse standing in a cobbled courtyard in front of a brick wall. On the left, a young man in a cap holds the horse's bridle. In the centre, an elderly bearded man in a long coat and apron stands beside the horse, which is dark-coated and tall. To their left, a large blackboard mounted on a stand is covered in rows of handwritten numbers and arithmetic problems, including fractions and multiplication sums. Several small round objects, possibly balls or stones, are scattered on the ground at the base of the blackboard. A second, smaller board with abacus-like apparatus is visible in the background.
Clever Hans’ owner claimed he could spell, tell the time, and even work with fractions.

Words are the fundamental thing that separates us from animals. Even animals who have an impressive range of calls use closed systems of communication – we see no open-ended creativity among them, or combining of existing elements to make new concepts. Humans can use the power of language to touch the hem of God Himself. We can use our God-given power over language to speak truth, or we can use it to facilitate deceit. This is not always a case of maliciously and wilfully telling lies. As the stories of Koko and Clever Hans show, people often hear what they want to hear and disregard the rest.

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