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In my talks I had therefore used all the contractions and colloquialisms I ordinarily use in conversation. In the printed version I reproduced this, putting don't and we've for do not and we have. And whereever, in the talks, I had made the importance of a word clear by the emphasis of my voice, I printed it in italics. I am now inclined to think that this was a mistake - an undesirable hybrid between the art of speaking and the art of writing. A talker ought to use variations of voice for emphasis because his medium naturally lends itself to that method: but a writer ought not to use italics for the same purpose. He has his own, different, means of bringing out the key words and ought to use them.

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However, in dialogue, I think it's sometimes useful to show that the speaker emphasized a particular word or phrase. But it should be used sparingly.