Happiness Is Not An Ideal Of Reason,

Always Treat People As Ends In Themselves, Never As Means To An End.

If You Punish A Child For Being Naughty, And Reward Him For Being Good, He Will Do Right Merely For The Sake Of The Reward; And When He Goes Out Into The World And Finds That Goodness Is Not Always Rewarded, Nor Wickedness Always Punished, He Will Grow Into A Man Who Only Thinks About How He May Get On In The World, And Does Right Or Wrong According As He Finds Advantage To Himself.

Maturity Is Having The Courage To Use One's Own Intelligence!

Experience Without Theory Is Blind, But Theory Without Experience Is Mere Intellectual Play.

The Instruction Of Children Should Aim Gradually To Combine Knowing And Doing. Among All Sciences Mathematics Seems To Be The Only One Of A Kind To Satisfy This Aim Most Completely.