Isaac Watts opens with an argument from design: tongues "were made to bless the Lord / And not speak ill of men." Speech has a purpose, and misusing it is a kind of betrayal. The poem builds from there, moving from playground quarrels to a mauling in the wilderness, and ends with a child asking to be made safe from his own mouth. Its central idea is that words are never "just words". Mockery, especially of what is holy, is a serious offence with serious consequences.
The first two stanzas sound like a patient teacher. "When others give a railing word, / We must not rail again" is a rule against retaliation. Then Watts raises the stakes one step at a time. Angry names deserve to be "chastised at school", which is an earthly penalty a child can picture. But the next lines jump to "hell-fire" for anyone who "calls his brother fool". That is an echo of a warning from Jesus in the Gospel of Matthew, so Watts is borrowing a very heavy authority. The distance between schoolroom and hell is covered in four lines, and the poem never slows down again.
The third stanza turns from advice to threat. The sinful verbs pile up as "mock, and jeer, and scoff", with the little word "and" pushing each one onto the heap. Here the rhyme tightens into something harsh: "scoff" is answered by "off", in the clipped promise that "The Lord shall cut them off." The phrase is a warning of judgment, but it also prepares for what comes next, when bodies are literally torn apart.
That example comes from the Bible's story of the prophet Elisha, in the Second Book of Kings, where a group of youngsters jeer at him and bears come out of the woods. Watts keeps the story's one line of direct speech: "Go up, thou bald head, go!" It is the only moment when anyone in the poem speaks, and it is a very small insult. Calling the children's behaviour "wanton play" makes it sound careless rather than evil. The poem then sets this taunt beside "God quickly stopped their wicked breath", and the shock comes from that gap. The punishment also fits the crime grimly well, since the mouths that mocked are silenced first. Look at the syntax of the next lines too: "With blood, and groans, and tears" repeats the "mock, and jeer, and scoff" pattern. Sin and punishment have the same shape, as if one grows directly out of the other.
The form helps the lesson stick. The stanzas alternate eight- and six-syllable lines, the same swinging pattern as many hymns, and the rhymes mostly alternate too. The wording is plain, and the opening line is made entirely of one-syllable words. This is verse meant to be memorised, and a child who learned it by heart would carry the bears around too. Watts has a quiet trick in the last line of stanza five. "Bears" and "tears" are paired on the page, so the attacker and the grief it causes are bound together in the rhyme.
The final stanza changes the pronouns. The earlier lines say "we", as in a general rule, but now the speaker says "me": "Grant me thy grace, and teach me how / To tame and rule my tongue." The word "terrible" here means "inspiring terror", and the speaker's response to the story is fear, not comfort. Describing "sinners e'er so young" also treats children as moral beings who are already answerable. There is a neat irony in "tame". The speaker must tame his tongue, and if he fails, the poem suggests, something much wilder than a tongue may need taming for him.
The poem matters because it is so honest about its method. It does not coax a child into kindness; it frightens him, and it trusts the strength of the image to do the work. Modern readers tend to find the mismatch between a jeer and a massacre disturbing, and that discomfort is part of why the poem still gets read. It shows how seriously earlier generations took the moral training of children, and how willing they were to use terror for it. Watts's moral verses for the young were familiar enough that Lewis Carroll later parodied another of them in *Alice's Adventures in Wonderland*, which says something about how deeply this style once ran in childhood.