"simply — "Never imagine yourself not to be otherwise than what it might appear to others that what you were or might have been was not otherwise tha… - Lewis Carroll

"Come back!" the Caterpillar called after her. "I've something important to say."
This sounded promising, certainly. Alice turned and came back again.
"Keep your temper," said the Caterpillar.

If you want to inspire confidence, give plenty of statistics – it does not matter that they should be accurate, or even intelligible, so long as there is enough of them.

I daresay you haven't had much practice. When I was your age I always did it for half an hour a day. Why, sometimes, I've believed as many as six impossible things before breakfast.