It Is The Rule Which Says That

We Do Not Know. We Can Only Guess.

The Belief In A Political Utopia Is Especially Dangerous. This Is Possibly Connected With The Fact That The Search For A Better World, Like The Investigation Of Our Environment, Is (if I Am Correct) One Of The Oldest And Most Important Of All The Instincts.

We Hate The Very Idea That Our Own Ideas May Be Mistaken, So We Cling Dogmatically To Our Conjectures.

We Have The Right Not To Tolerate The Intolerant. We Should Tolerate Even Them Whenever We Can Do So Without Running A Great Risk; But The Risk May Become So Great That We Cannot Allow Ourselves The Luxury.

The Survival Value Of Intelligence Is That It Allows Us To Extinct A Bad Idea, Before The Idea Extincts Us.