401 Quotes About Certainty

At the core of all well-founded belief lies belief that is unfounded.

Anyone who takes a decided line in certain matters, is sure to lead all the rest.

The scientist believes in proof without certainty, the bigot in certainty without proof.

All testing, all confirmation and disconfirmation of a hypothesis takes place already within a system. And this system is not a more or less arbitrary and doubtful point of departure for all our arguments: no, it belongs to the essence of what we call an argument. The system is not so much as the point of departure, as the element in which arguments have their life.

Roark spoke quietly. He was the only man in the room who felt certain of his own words.

Come up with ideas (not necessarily logical or practical ideas), and be certain about them, and your life will sort out.

I don’t know whether there are numbers. And you?

You can be dead sure and still be dead wrong.

It's not vague,' Anna said. 'I'm certain of it. Just as when you're certain you did have a dream...you knew you dreamed...but you can't remember any of the details.