Those who have the privilege to know have the duty to act.

Politics is for the present, but an equation is for eternity.

Ninety nine failed solutions equals a gain of 99 pieces of information.

By academic freedom I understand the right to search for truth and to publish and teach what one holds to be true. This right also implies a duty: one must not conceal any part of what one has recognized to be true.

Nobody knows how the stand of our knowledge about the atom would be without him. Personally, [Niels] Bohr is one of the amiable colleagues I have met. He utters his opinions like one perpetually groping and never like one who believes himself to be in possession of the truth.

There's something to be said for relatives...it has to be said because it's unprintable!

You ask me if I keep a notebook to record my great ideas. I've only ever had one.