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The answer is so obvious, it's been staring at you from the moment you had your first opinion. The best way to exude trustworthiness by the buckets is to pursue your passion. Because you love what you do, you don't have to lie. There is no need for gimmicks or hype or false hope or artificial rewards and bonuses. Because people see and feel that you enjoy what you do, they won't see the need to second guess you.
If you want a longer explanation, read John Hagel's post.
If you have more time and need more convincing, read his co-authored book.