Isaac Watts, one of the best-known writers of English hymns, gave this one a subtitle that works as a summary: "Prophecy and inspiration." In sixteen lines he builds a small argument that begins with the ancient prophets and ends with the reader holding a book. Along the way he sets aside every rival source of spiritual certainty. The central idea is that God's message, once spoken through human voices, has been preserved on the page, and that this written record is a firmer ground for faith than any private feeling.
The first stanza is about where prophecy comes from, and it is careful to take the credit away from the prophets. They spoke "by an order from the Lord," a phrase that sounds almost like a official command, and the prophets are messengers carrying someone else's words. Watts puts the process in the body: God's Spirit works on their "tongues" and warms their "hearts" with "heav'nly fire." The word "inspire" is worth pausing on. It comes from a Latin word meaning to breathe into, so the prophets are filled with divine breath before they speak it out again. That idea of breath runs through the whole poem.
In the second stanza, proof arrives. The "works and wonders" the prophets performed "confirmed the messages they brought," like credentials shown at a door. Then comes the poem's neatest line: "The prophet's pen succeeds his breath." The verb "succeeds" suggests an heir taking over from a ruler, as if the written text were the prophet's lawful successor. The next line gives the reason, "To save the holy words from death." Spoken words die with the speaker, and writing is presented as a rescue.
The third stanza shifts the poem from reporting to prayer. For the first time we get "I" and "mine," and for the first time God is addressed directly ("Great God"). The tone softens into "pleasure" and the "dear volume." Reading becomes seeing: "There my Redeemer's face I see." The book is imagined as a portrait or a window, and the rhyme of "see" with "me" ties the reader's eye to a very personal claim, "his name who died for me." Watts never names Christ outright here. The pronouns and the title "Redeemer" do the work, which gives the lines a hushed, intimate feel.
The last stanza turns on a rejection: "Let the false raptures of the mind / Be lost, and vanish in the wind." The word "raptures" matters because the first stanza celebrated hearts warmed by fire. Watts has no quarrel with feeling that comes from God, but he distrusts inward ecstasy that has no outside check. His image for it is wind, and the contrast with the earlier "breath" is sharp. Breath, once it has been written down, survives. Raptures are only air, and they blow away. The closing couplet answers with solid words: "fix," "secure," "endure." The final line, "This is thy word, and must endure," is almost all one-syllable words, and the heavy "must" makes it sound like a verdict.
The form supports this plainness. Every line has eight syllables and a steady iambic beat ("'Twas BY an OR-der FROM the LORD"), and the rhymes come in couplets, so each pair of lines closes its thought with a click: "Lord/word," "wrought/brought," "mind/wind." That regularity makes the verses easy to learn by heart and to sing, which is what a hymn needs. The vocabulary is simple too, with no ornament that would distract from the point.
What makes the poem worth reading is how clearly it is organised. It moves from the source of the message to the evidence for it, then to the believer's own experience, and finally to a conclusion, like a very short sermon. It also shows something about how people think about writing. For Watts, putting a message on paper is a way of keeping it from vanishing, and the poem ends by trusting what lasts over what merely feels intense.