I Am Firm; You Are Obstinate; He

The Essence Of Life Is Doing Things For Their Own Sakes.

The Desire To Understand The World And The Desire To Reform It Are The Two Great Engines Of Progress, Without Which Human Society Would Stand Still Or Retrogress.

I Do Not Think Any Reasonable Person Can Doubt That In India, China And Japan, If The Knowledge Of Birth Control Existed, The Birthrate Would Fall Very Rapidly

Almost Everything That Distinguishes The Modern World From Earlier Centuries Is Attributable To Science, Which Achieved Its Most Spectacular Triumphs In The Seventeenth Century.

I Am Delighted To Know That Principia Mathematica Can Now Be Done By Machinery. . . I Am Quite Willing To Believe That Anything In Deductive Logic Can Be Done By Machinery.