Why do some Bibles include the words of Jesus in red?

Open many popular Bibles, particularly in the Gospels, and you will notice certain lines printed in red rather than black ink. New readers sometimes assume this reflects some ancient practice or a special mark of divine authority placed on those specific words. In reality, the red-letter tradition is a relatively recent printing convention with a fairly specific and interesting origin story.

This formatting choice is now so common that many readers who grew up with a red-letter Bible assume every edition works this way, until they pick up a plain-text translation and notice the red is simply gone. Both formats contain the exact same inspired words; only the visual presentation differs. Publishers offer both because different readers find different formats helpful, not because one edition is somehow more complete or more faithful to the original text than the other.

The idea is generally credited to Louis Klopsch, editor of a religious newspaper called The Christian Herald, who published the first red-letter New Testament in 1899. According to the commonly told account, he was struck by Jesus's words instituting the new covenant, 'This cup is the new covenant in my blood, which is poured out for you' (Luke 22:20), and wanted a simple way for readers to instantly locate everything Jesus himself said throughout the Gospels.

The idea caught on quickly, and red-letter Bibles became especially popular in American evangelical publishing throughout the early twentieth century, a practice that continues in many editions today. It is worth being clear, however, that no ancient manuscript used colored ink to distinguish Jesus's words this way; this is entirely a modern printing choice made for the convenience of readers, not a feature preserved from the original text.

Interestingly, some ancient manuscripts did occasionally use colored ink, most often red, but for a different purpose entirely: highlighting section headings, decorative initial letters, or important liturgical markings for public reading, not to single out any one speaker's words. The modern red-letter convention borrowed the visual idea of colored emphasis but applied it to an entirely new purpose that the earliest scribes never intended.

It is important not to draw the wrong theological conclusion from the red print. All Scripture, Old and New Testament alike, is equally 'God-breathed' (2 Timothy 3:16), regardless of typesetting. Jesus himself is described as the eternal Word (John 1:1), meaning all of Scripture ultimately testifies to him, not only the sections directly quoting him. He also promised that the Spirit would guide the apostles into all truth (John 14:26), giving their New Testament letters genuine apostolic authority equal in weight to his own recorded words.

Jesus himself repeatedly affirmed the full authority of the Old Testament, saying he came not to abolish the Law and the Prophets but to fulfill them (Matthew 5:17). If Jesus regarded every word of the Old Testament as trustworthy Scripture, it would be strange for his followers today to treat only his own directly quoted words as uniquely weighty, while quietly downgrading the very Scriptures he treated with such reverence.

Some readers unintentionally develop a 'canon within the canon,' treating red-letter passages as somehow more important or binding than the rest of Scripture, including the Old Testament that Jesus himself constantly quoted and affirmed as authoritative. This subtly diminishes the very Scriptures Jesus treated as fully trustworthy and can leave a reader with a thinner, less complete picture of God's revelation.

This tendency shows up in small, practical ways. Someone might quote Jesus's words about loving your enemies while brushing past Paul's equally authoritative instructions elsewhere in the New Testament, quietly treating the black print as somehow more optional or culturally conditioned. But Paul's letters claim the same Spirit-given authority Jesus promised the apostles (John 14:26, 2 Peter 1:21), and Jesus himself commissioned the apostles to teach 'everything I have commanded you' (Matthew 28:20), which the New Testament epistles go on to do at length. Reading selectively by ink color, rather than receiving the whole counsel of Scripture as binding, can quietly reshape a reader's theology without them ever noticing it happening.

Red letters are simply one example among many helpful, non-inspired study aids added to Bibles over the centuries for the reader's benefit. Chapter divisions were added by Archbishop Stephen Langton in the thirteenth century, and verse numbers were added by the printer Robert Estienne in the sixteenth century, neither of which existed in the original manuscripts. Paragraph headings, cross-reference columns, and maps serve the same purpose today: making an ancient, complex book easier for modern readers to navigate.

Recognizing red letters as part of this broader tradition of helpful formatting, rather than as an ancient or divinely instituted feature, keeps the focus where it belongs: on the actual content and authority of what is being said, not on the color of the ink used to print it.

Used rightly, red letters can be a genuinely helpful visual tool, especially for locating specific teachings of Jesus quickly during study or conversation. Just remember as you read that every word on the page, red or black, carries the same divine authority and deserves the same careful attention.

A simple safeguard is to occasionally read straight through an entire book rather than only skimming the red portions of the Gospels, so that Jesus's teaching is always encountered within the fuller argument and narrative surrounding it, and so the rest of Scripture receives the same close attention and weight. Used alongside a normal, complete reading habit, a red-letter edition becomes a helpful reference tool rather than an accidental filter on what counts as truly important in God's word.