Every Solution Of A Problem Raises New

No Matter How Many Instances Of White Swans We May Have Observed, This Does Not Justify The Conclusion That All Swans Are White.

The Only Way To Test A Hypothesis Is To Look For All The Information That Disagrees With It.

A System Is Empirical Or Scientific Only If It Is Capable Of Being Tested By Experience. These Considerations Suggest That Not The Verifiability But The Falsifiability Of A System Is To Be Taken As A Criterion Of Demarcation... It Must Be Possible For An Empirical Or Scientific System To Be Refuted By Experience.

The Genuine Rationalist Does Not Think That He Or Anyone Else Is In Possession Of The Truth; Nor Does He Think That Mere Criticism As Such Helps Us Achieve New Ideas. But He Does Think That, In The Sphere Of Ideas, Only Critical Discussion Can Help Us Sort The Wheat From The Chaff.

We Do Not Know. We Can Only Guess.