The Entire Universe Is Perfused With Signs,

I Define A Sign As Anything Which Is So Determined By Something Else, Called Its Object, And So Determines An Effect Upon A Person, Which Effect I Call Its Interpretant, That The Latter Is Thereby Mediately Determined By The Former.

A Sign, Or Representamen, Is Something Which Stands To Somebody For Something In Some Respect Or Capacity. It Addresses Somebody,that Is, Creates In The Mind Of That Person An Equivalent Sign, Or Perhaps A More Developed Sign. That Sign Which It Creates I Call The Interpretant Of The First Sign. The Sign Stands For Something, Its Object. It Stands For That Object, Not In All Respects, But In Reference To A Sort Of Idea, Which I Have Sometimes Called The Ground Of The Representamen.

The Essence Of Belief Is The Establishment Of A Habit; And Different Beliefs Are Distinguished By The Different Modes Of Action To Which They Give Rise.

There Is Not A Single Truth Of Science Upon Which We Ought To Bet More Than About A Million Of Millions To One.

Mathematics Is Purely Hypothetical: It Produces Nothing But Conditional Propositions.