Here's a little advice from Ælfric, a West Saxon monkish scribe and author from the turn of the first millennium:
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.
Sadly I don't have eternal damnation in the fires of hell as a sanction for lazy or dishonest students… though it's certainly deserved in the case of the one who told me that 'Paradise Lost is a post-modern novel'.