May I suggest some serious study of a true master of the art:
The essay / lecture starts on page 202 of this book:
https://archive.org/details/22362450...e/n11/mode/2up
"The Decay of the Art of Lying" by Mark Twain
The book is free to download as PDF, or EBook and there is an audio version too:
https://archive.org/details/MarkTwai...fTheArtOfLying
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.