Change Is One Thing, Progress Is Another.

Bad Philosophers May Have A Certain Influence; Good Philosophers, Never.

It Is Not What The Man Of Science Believes That Distinguishes Him, But How And Why He Believes It. His Beliefs Are Tentative, Not Dogmatic; They Are Based On Evidence, Not On Authority Or Intuition.

War...seems A Mere Madness, A Collective Insanity.

You Could Take Up The Line That Some Of The Gnostics Took Up - A Line Which I Often Thought Was A Very Plausible One - That As A Matter Of Fact This World That We Know Was Made By The Devil At A Moment When God Was Not Looking. There Is A Good Deal To Be Said For That, And I Am Not Concerned To Refute It.

Scientific Method, Although In Its More Refined Forms It May Seem Complicated, Is In Essence Remarkably Simply. It Consists In Observing Such Facts As Will Enable The Observer To Discover General Laws Governing Facts Of The Kind In Question. The Two Stages, First Of Observation, And Second Of Inference To A Law, Are Both Essential, And Each Is Susceptible Of Almost Indefinite Refinement. (1931)