Do Not Let Yourself Be Tainted With

As In The Experimental Sciences, Truth Cannot Be Distinguished From Error As Long As Firm Principles Have Not Been Established Through The Rigorous Observation Of Facts.

The More I Know, The More Nearly Is My Faith That Of The Breton Peasant. Could I But Know All I Would Have The Faith Of A Breton Peasant Woman.

These Are The Living Springs Of Great Thoughts And Great Actions. Everything Grows Clear In The Reflections From The Infinite.

Messieurs, C'est Les Microbes Qui Auront Le Dernier Mot." (gentlemen, It Is The Microbes Who Will Have The Last Word.)

Without Theory, Practice Is But Routine Born Of Habit. Theory Alone Can Bring Forth And Develop The Spirit Of Invention. ... [do Not] Share The Opinion Of Those Narrow Minds Who Disdain Everything In Science Which Has Not An Immediate Application. ... A Theoretical Discovery Has But The Merit Of Its Existence: It Awakens Hope, And That Is All. But Let It Be Cultivated, Let It Grow, And You Will See What It Will Become.