"If everyone you knew spoke the truth, it would be almost as terrible as if everyone you knew lied."

"Kant, who was searching for some universal moral principle, believed that if everybody lied the world would fall into shambles. Nobody would ever trust another person.... I say, “You wouldn’t want to live in a world where you can’t be conned, because if you were, you would be living in a world with no trust. That’s the price you pay for trust, is being conned."

The relationship between lying/truthtelling and trust.