Nothing Can Be Taught To A Man,

With Regard To Matters Requiring Thought: The Less People Know And Understand About Them, The More Positively They Attempt To Argue Concerning Them.

I Wish, My Dear Kepler, That We Could Have A Good Laugh Together At The Extraordinary Stupidity Of The Mob. What Do You Think Of The Foremost Philosophers Of This University? In Spite Of My Oft-repeated Efforts And Invitations, They Have Refused, With The Obstinacy Of A Glutted Adder, To Look At The Planets Or The Moon Or My Glass [telescope].

All Truths Are Easy To Understand Once They Are Discovered; The Point Is To Discover Them.

To Excite In Us Tastes, Odors, And Sounds I Believe That Nothing Is Required In External Bodies Except Shapes, Numbers, And Slow Or Rapid Movements. ... If Ears, Tongues, And Noses Were Removed, Shapes And Numbers And Motions Would Remain, But Not Odors Or Tastes Or Sounds.

The Earth, In Fair And Grateful Exchange, Pays Back To The Moon An Illumination Similar To That Which It Receives From Her Throughout Nearly All The Darkest Gloom Of The Night.