Aelfrich Grammaticus and the Importance of Copyediting

Aelfric (c. 955-c. 1020) was a monk and then abbot at the monastery of Cerne Abbas in Dorset, and later the first abbot of Eynsham in Oxfordshire. He was a prolific writer and translator and was called Aelfric Grammaticus ("The Grammarian"). He offers great advice to any writer, advice that was very important in his own day as the work that the monks were transcribing were laying the foundation of language that was becoming standard:

Now I desire and beseech, in God's name, if anyone will transcribe this book, that he carefully correct it by the copy, lest we be blamed through careless writers. He does great evil who writes carelessly, unless he correct it. It is as though he turn true doctrine into false error.  Therefore everyone should make straight that which he before bent crooked, if he will be guiltless at God's doom. 

Careless errors in transcription were mistakes that lasted, and could compromise the work of standardization that the monks, in the second half of the tenth century, were attempting.  

But I think this is admonishment is helpful to keep in mind though I might do away with such a prediction of doom if you ignore it.