Every Genuine Test Of A Theory Is

No Number Of Sightings Of White Swans Can Prove The Theory That All Swans Are White. The Sighting Of Just One Black One May Disprove It.

If We Are Uncritical We Shall Always Find What We Want: We Shall Look For, And Find, Confirmations, And We Shall Look Away From, And Not See, Whatever Might Be Dangerous To Our Pet Theories. In This Way It Is Only Too Easy To Obtain What Appears To Be Overwhelming Evidence In Favor Of A Theory Which, If Approached Critically, Would Have Been Refuted.

There Will Be Well-testable Theories, Hardly Testable Theories, And Non-testable Theories. Those Which Are Non-testable Are Of No Interest To Empirical Scientists. They May Be Described As Metaphysical.

. . . It Seems To Me Certain That More People Are Killed Out Of Righteous Stupidity Than Out Of Wickedness.

I Have Spoken To Einstein And He Admitted To Me That His Theory Was In Fact No Different From The One Of Parmenides.