True Science Teaches Us To Doubt And,

Proof That A Given Condition Always Precedes Or Accompanies A Phenomenon Does Not Warrant Concluding With Certainty That A Given Condition Is The Immediate Cause Of That Phenomenon. It Must Still Be Established That When This Condition Is Removed, The Phenomen Will No Longer Appear.

It Is What We Know Already That Often Prevents Us From Learning.

Mediocre Men Often Have The Most Acquired Knowledge. It Is In The Darker. It Is In The Darker Regions Of Science That Great Men Are Recognized; They Are Marked By Ideas Which Light Up Phenomena Hitherto Obscure And Carry Science Forward.

Hatred Is The Most Clear- Sighted, Next To Genius.

Man Can Learn Nothing Unless He Proceeds From The Known To The Unknown.