Personally, People Know Themselves Very Poorly.

When I Recall Today My Early Youth, I Should Take The Boy That I Then Was, With The Exception Of A Few Individual Features, For A Different Person, Were It Not For The Existence Of The Chain Of Memories.

The Plain Man Is Familiar With Blindness And Deafness, And Knows From His Everyday Experience That The Look Of Things Is Influenced By His Senses; But It Never Occurs To Him To Regard The Whole World As The Creation Of His Senses.

Archimedes Constructing His Circle Pays With His Life For His Defective Biological Adaptation To Immediate Circumstances.

Not Bodies Produce Sensations, But Element-complexes (sensation-complexes) Constitute The Bodies. When The Physicist Considers The Bodies As The Permanent Reality, The 'elements' As The Transient Appearance, He Does Not Realise That All 'bodies' Are Only Mental Symbols For Element-complexes (sensation-complexes).

Strange As It May Sound, The Power Of Mathematics Rests On Its Evasion Of All Unnecessary Thought And On Its Wonderful Saving Of Mental Operations.