Knock the "t" off the "can't." Samuel Johnson
We are all such a waste of our potential, like three-way lamps using one-way bulbs. Mignon McLaughlin, The Neurotic's Notebook, 1960
I have great faith in fools; self-confidence my friends call it. Edgar Allan Poe
If you doubt yourself, then indeed you stand on shaky ground. Henrik Ibsen
Anyone who ever gave you confidence, you owe them a lot. Truman Capote, Breakfast at Tiffany's, 1958, spoken by the character Holly Golightly