When writing, and especially while proofreading and correcting your work, I would highly recommend a Braille display. Reading in Braille can help you correct relatively easy mistakes that you could overlook when using speech. For example, writing "there" instead of "their" and vice versa, along with a bunch of other simple mistakes. It can also help you reinforce correct punctuation and paragraph use. If not, I'd suggest using eSpeak NG to write and proofread. If you're looking for a more natural speech synthesizer, try Vocalizer.
Do not, for the love of god, use eloquence. While it can speak fast, you'll probably end up spelling loads of things wrong and thinking you spelled them right.
Agreed. I often can tell an Eloquence user who doesn't thoroughly proofread from the spelling mistakes they make. Eloquence users, be extra careful to check your spelling; Don't assume Eloquence will point out your errors, because it generally won't.
The Beast adopted new raiment and studied the ways of Time and Space and Light and the Flow of energy through the Universe. From its studies, the Beast fashioned new structures from oxidised metal and proclaimed their glories. And the Beast’s followers rejoiced, finding renewed purpose in these teachings.
from The Book of Mozilla, 11:14