“The key to success is sincerity. If you can fake that you've got it made.”
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What you have is Trump who’s rough on the outside, and a bunch of powerful politicians who are preach kindness and gentleness but on the inside are power grabbers trying to grab power by deception.
The experienced politician told the newly elected one: the secret to success in politics is dignity and sincerity. As soon as you learn how to fake those, your success is assured.