I Define A Sign As Anything Which

It Is Not Too Much To Say That Next After The Passion To Learn There Is No Quality So Indispensable To The Successful Prosecutionof Science As Imagination. Find Me A People Whose Early Medicine Is Not Mixed Up With Magic And Incantations, And I Will Find You A People Devoid Of All Scientific Ability.

We Cannot Begin With Complete Doubt.

Kepler's Discovery Would Not Have Been Possible Without The Doctrine Of Conics. Now Contemporaries Of Kepler-such Penetrating Minds As Descartes And Pascal-were Abandoning The Study Of Geometry ... Because They Said It Was So Utterly Useless. There Was The Future Of The Human Race Almost Trembling In The Balance; For Had Not The Geometry Of Conic Sections Already Been Worked Out In Large Measure, And Had Their Opinion That Only Sciences Apparently Useful Ought To Be Pursued, The Nineteenth Century Would Have Had None Of Those Characters Which Distinguish It From The Ancien Régime.

The Idea Does Not Belong To The Soul; It Is The Soul That Belongs To The Idea.

It Is A Common Observation That A Science First Begins To Be Exact When It Is Quantitatively Treated. What Are Called The Exact Sciences Are No Others Than The Mathematical Ones.