Nothing is as seductive as the assurance of success.
Gertrude Himmelfarb
I go the way that Providence dictates with the assurance of a sleepwalker.
Adolf Hitler
There have not been any troughs as regards my work. There's never been a trough of my assurance.
Ben Kingsley
Forbearance is the root of quietness and assurance forever.
Ieyasu Tokugawa