sure of oneself

I like the idea of Jon Hamm… There have been discussions—though I'm not sure how serious they've been.

When a man converses with himself, he is sure that he does not converse with an enemy.

I am therefore quite sure I shall be content to await his father's consent, should it not come these many years.

And sure enough when Sunday came, and the pencil was restored to him, he promptly showed nurse his picture.

He had seen the act committed, he felt sure but had made no effort whatever to stop the thief.

Gold and silver make the feet stand sure: but wise counsel is above them both.