The Doubter Is A True Man Of

The Great Experimental Principle, Then, Is Doubt, That Philosophic Doubt Which Leaves To The Mind Its Freedom And Initiative, And From Which The Virtues Most Valuable To Investigators In Physiology And Medicine Are Derived.

Real Science Exists, Then, Only From The Moment When A Phenomenon Is Accurately Defined As To Its Nature And Rigorously Determined In Relation To Its Material Conditions, That Is, When Its Law Is Known. Before That, We Have Only Groping And Empiricism.

[those] Who Have An Excessive Faith In Their Theories Or In Their Ideas Are Not Only Poorly Disposed To Make Discoveries, But They Also Make Very Poor Observations.

Ardent Desire For Knowledge, In Fact, Is The One Motive Attracting And Supporting Investigators In Their Efforts; And Just This Knowledge, Really Grasped And Yet Always Flying Before Them, Becomes At Once Their Sole Torment And Their Sole Happiness. Those Who Do Not Know The Torment Of The Unknown Cannot Have The Joy Of Discovery Which Is Certainly The Liveliest That The Mind Of Man Can Ever Feel.

The Terrain Is Everything; The Germ Is Nothing.