In my mind, I never doubted whether I was going to achieve what I wanted to do. I just had to decide what it is I wanted to do.

- Curt Schilling

I never doubted that I would be a good mayor. I never did.

- Ed Koch

I think my lesson is to back yourself once you've been given a job. Far too often, I've been given a job and then doubted why I'm there.

- Jamie Dornan

I always doubted myself. I doubted the way I looked, my body, my voice - everything.

- Patricia Kaas

No one would have doubted his ability to reign had he never been emperor.

- Tacitus

I always knew I was going to be rich. I don't think I ever doubted it for a minute.

- Warren Buffett