All Mankind's Unhappiness Derives From One Thing:

When We Do Not Know The Truth Of A Thing, It Is Good That There Should Exist A Common Error Which Determines The Mind Of Man, As, For Example, The Moon, To Which Is Attributed The Change Of Seasons, The Progress Of Diseases, Etc. For The Chief Malady Of Man Is A Restless Curiosity About Things Which He Cannot Understand; And It Is Not So Bad For Him To Be In Error As To Be Curious To No Purpose.

Those We Call The Ancients Were Really New In Everything.

Therefore, Those To Whom God Has Imparted Religion By Intuition Are Very Fortunate And Justly Convinced. But To Those Who Do Not Have It, We Can Give It Only By Reasoning, Waiting For God To Give Them Spiritual Insight, Without Which Faith Is Only Human And Useless For Salvation.

The Best Defense Against Logic Is Ignorance.

The Present Letter Is A Very Long One, Simply Because I Had No Leisure To Make It Shorter.