It Is Still Open For Me, As

The Fact That Different Cultures Have Different Practices No More Refutes [moral] Objectivism Than The Fact That Water Flows In Different Directions In Different Places Refutes The Law Of Gravity

It Seems To Me, That The Only Objects Of The Abstract Sciences Or Of Demonstration Is Quantity And Number, And That All Attempts To Extend This More Perfect Species Of Knowledge Beyond These Bounds Are Mere Sophistry And Illusion.

All Knowledge Degenerates Into Probability.

Human Nature Is The Only Science Of Man; And Yet Has Been Hitherto The Most Neglected.

All That Belongs To Human Understanding, In This Deep Ignorance And Obscurity, Is To Be Sceptical, Or At Least Cautious, And Not To Admit Of Any Hypothesis Whatever, Much Less Of Any Which Is Supported By No Appearance Of Probability.