The Very Essence Of Instinct Is That

Disbelief Crept Over Me At A Very Slow Rate, But At Last It Was Complete.

A Man Who Has No Assured And Ever Present Belief In The Existence Of A Personal God Or Of A Future Existence With Retribution And Reward, Can Have For His Rule Of Life, As Far As I Can See, Only To Follow Those Impulses And Instincts Which Are The Strongest Or Which Seem To Him The Best Ones

I Am A Firm Believer, That Without Speculation There Is No Good And Original Observation.

Light Will Be Thrown On The Origin Of Man And His History.

This Preservation Of Favourable Variations And The Destruction Of Injurious Variations, I Call Natural Selection, Or The Survival Of The Fittest. Variations Neither Useful Nor Injurious Would Not Be Affected By Natural Selection And Would Be Left A Fluctuating Element.