Conยญtents
How many times a day do you hit backยญspace? Or are you perยญhaps old school and use a real penยญcil? In that case: how many times a day do you use your rubยญber (or erasยญer, if you live across the pond)? Quite a few, right?!
But how many times a day do you erase someยญthing Roman style?
Wax And Writing
In ancient Rome, you would use wax tablets to write on. If you needยญed to make a list, a note, a draft, or just pracยญtice your handยญwritยญing at school, wastยญing papyrus or parchยญment and ink was out of the quesยญtion. (Bischoff 1990, pp. 7โ14) It was too expensive.
Instead, you would use someยญthing that could be re-used over and over again. Just like in modยญern times, the oldยญer genยญerยญaยญtions used slate, the ancient Roman genยญerยญaยญtions used wax tablets.
Roman Rubber
In order to write on a wax tablet, the Romans used a speยญcial kind of pen called a style or a stilus/stylus. The stilus was sharp and pointy at one end and flat at the othยญer. You wrote with the sharp end in the wax and erased with the flat side, either to make alterยญations or to write someยญthing comยญpleteยญly difยญferยญent on the tablet.
Thereยญfore the expresยญsion โto turn the penโ or rather Stilum vertยญere means to erase someยญthing or to change or corยญrect something.

Turn Turn Turn
Horace was no stranger to the wax tablet or the stilus and we learn from him, in Satires lib. X.72, that a good writer, a good author, a good poet is nevยญer a stranger to turnยญing the pen, or in Horaceโs case โ the stilus:
โSaepe stilum verยญtas, iterum quae digna legi sint
scripยญturus,โ
i.e. โOften must you turn your penยญcil to erase, if you hope to write someยญthing worth a secยญond readยญing,โ (transl. Rushยญton Fairยญclough, 1926)
Hieronymus On A Change Of Heart
The expresยญsion can also be used in a derived meanยญing, where the turnยญing of the pen repยญreยญsents a perยญsonยญโs change of opinยญion. (Boeft & Driยญjvers, 2013)
The great humanยญist Erasยญmus (1466โ1536) disยญcussยญes the expresยญsion in his Adaยญgia and menยญtions Jerome who wrote:
โverยญtis stilum et omnia lauยญdaยญta prius vituperasโ
i.e โyou turn your pen and critยญiยญcize everyยญthing you had preยญviยญousยญly praisedโ
Simยญply, you change your mind, your opinion.
This use of the expresยญsion seems to be less comยญmon, but it is a good metaphor for a change of heart.

Erroneous Erasmus?
In his Adaยญgia, Erasยญmus goes on to state that Cicero too used the expresยญsion stilum vertยญere in the same sense that Jerome.
This howยญevยญer can be debatยญed as Cicero, in his speech against Verยญres, wrote:
โCum haec ad istum afferยญrenยญtur, perยญtimuit aliยญquanยญdo et comยญmoยญtus est; verยญtit stilum in tabยญuยญlis suis, quo facยญto causam omnem everยญtit suam; nihil enim sibi reliqui fecit quod defenยญdi aliยญqua ratione posset.โ
โ Cicero, In Verยญrem, 2.2.101
โWhen this news reached Verยญres, he was at last thorยญoughยญly frightยญened and upset; and then he applied the blunt end of his style to his records, thereยญby makยญing an end of all his chances of acquitยญtal, for he has left himยญself no loop-hole for any sort of defence.โ (transl. Greenยญwood, 1928)
Verยญres does not seem to have had a change of opinยญion, but it seems to have been a rather litยญerยญal erasยญing of his records. You can read the entire piece from Erasยญmus down below.
Bonus Latin: Erasmusโ Text
Erasยญmus of Rotยญterยญdam, the trustยญworยญthy humanยญist, nevยญer failed to comยญment on good Latin expresยญsions and wrote a fair amount about stilum vertยญere in his Adaยญgia.
So, if you are up for some extra readยญing in Latin, hereโs what he has to say about it:
โStilum vertยญere est mutare quod scripseris. Horยญatius in Serยญmonibus: โSaepe stilum verยญtas.โ Antiqยญuiยญtus in tabelยญlis cerยญatis scripยญtitaยญbant stiยญlo graphiario, cuius altera parte nimirum acuยญta per aequor cereum ducยญta litยญteras exaraยญbant, altera latiore rurยญsum oblitยญterยญaยญbant, quod exarassent.
Hieronyยญmus Aduerยญsus Rufinum: โQuamdiu non renueยญbam lauยญdaยญtionem tuam, sequeยญbaris ut magยญistrum, fratrem et colยญlegam vocabas et catholicum in omnibus fateยญbaris. Postquam vero non agnoui laudes tuas et me indignum tanยญti viri praeยญcoยญnio iudiยญcaui, verยญtis stilum et omnia lauยญdaยญta prius vituยญperas de eodem ore et dulce proยญferยญens et amarum.โ
Hieronyยญmus imiยญtaยญtus est Ciceronem, qui Verยญriยญnarum actionยญum iiii. scribยญit in hunc modยญum: โTimuit aliยญquanยญdo et comยญmoยญtus est, verยญtit stilum in tabยญuยญlis suis, quo facยญto causam omnem euerยญtit suam.โ Inuยญenยญiยญtur et stilum infigereโ et โstiยญlo appetereโ pro eo quod est: โscripยญtis insecยญtari atque inuehiโ โ.

References
Bernยญhard Bischoff, Latin Palaeogยญraยญphy: Antiqยญuiยญty & the Midยญdle Ages, transl. Dรกibยญhรญ ร Crรณinรญn & David Ganz. Camยญbridge, 1990.
Horace. Satires. Episยญtles. The Art of Poetยญry. Transยญlatยญed by H. Rushยญton Fairยญclough. Loeb Clasยญsiยญcal Library 194. Camยญbridge, MA: Harยญvard Uniยญverยญsiยญty Press, 1926.
Jan den Boeft & Jan Willem Driยญjvers, Philoยญlogยญiยญcal and Hisยญtorยญiยญcal Comยญmenยญtary on Ammiยญanus Marยญcelliยญnus XXIX [Elecยญtronยญic resource], BRILL, 2013, p.118
Cicero. The Verยญrine Oraยญtions, Volยญume I: Against Caeยญcilยญius. Against Verยญres, Part 1; Part 2, Books 1โ2. Transยญlatยญed by L. H. G. Greenยญwood. Loeb Clasยญsiยญcal Library 221. Camยญbridge, MA: Harยญvard Uniยญverยญsiยญty Press, 1928.
















