I'm quoting a sentence from Carl von Clausewitz' On War. He has part of the sentence italicized though:

> 
> Obstinacy *is a fault of temperament*.
> 
> 
> 

Is it necessary to maintain his formatting? Ideally, I would like omit the formatting so it's consistent with the rest of the sentence that the quote will be placed in.

I know if I was *adding* italics/bolding for emphasis, I would need to indicate that the formatting was my own by saying something like "Emphasis mine". Is there a reverse of this though to indicate that I've removed emphasis (which seems to be his intent)?