All Our Thoughts And Concepts Are Called

All Our Thoughts And Concepts Are Called Up By Sense-experiences And Have A Meaning Only In Reference To These Sense-experiences. On The Other Hand, However, They Are Products Of The Spontaneous Activity Of Our Minds; They Are Thus In No Wise Logical Consequences Of The Contents Of These Sense-experiences. If, Therefore, We Wish To Grasp The Essence Of A Complex Of Abstract Notions We Must For The One Part Investigate The Mutual Relationships Between The Concepts And The Assertions Made About Them; For The Other, We Must Investigate How They Are Related To The Experiences.