Principle of charity. He agreed with this statement: "I was not made for that [lying]." He's saying knowing your dark side is a powerful help. Jung said the same - usually using slightly different words "shadow", "Id", or "shadow aspect/archetype." He hasn't endorsed lying as a lifestyle, and I would mention that those who have encountered and acknowledged their shadow are far less likely to project it on others as you just did - something Jung discusses at length.