No Matter How Many Instances

Whenever A Theory Appears To You As The Only Possible One, Take This As A Sign That You Have Neither Understood The Theory Nor The Problem Which It Was Intended To Solve.

We Should Therefore Claim, In The Name Of Tolerance, The Right Not To Tolerate The Intolerant.

True Ignorance Is Not The Absence Of Knowledge, But The Refusal To Acquire It.

Science Is The Century-old Endeavour To Bring Together By Means Of Systematic Thought The Perceptible Phenomena Of This World Into As Thorough-going An Association As Possible. To Put It Boldly, It Is The Attempt At A Posterior Reconstruction Of Existence By The Process Of Conceptualization. Science Can Only Ascertain What Is, But Not What Should Be, And Outside Of Its Domain Value Judgements Of All Kinds Remain Necessary.

Psychologism Is, I Believe, Correct Only In So Far As It Insists Upon What May Be Called 'methodological Individualism' As Opposed To 'methodological Collectivism'; It Rightly Insists That The 'behaviour' And The 'actions' Of Collectives, Such As States Or Social Groups, Must Be Reduced To The Behaviour And To The Actions Of Human Individuals. But The Belief That The Choice Of Such An Individualist Method Implies The Choice Of A Psychological Method Is Mistaken.