Give Unqualified Assent To No Propositions But

The Only People, Scientific Or Other, Who Never Make Mistakes Are Those Who Do Nothing.

You May Read Any Quantity Of Books, And You May Almost As Ignorant As You Were At Starting, If You Don't Have, At The Back Of Yourminds, The Change For Words In Definite Images Which Can Only Be Acquired Through The Operation Of Your Observing Faculties On The Phenomena Of Nature.

Claiming My Right To Follow Whethersoever Science Should Lead... It Is As Respectable To Be Modified Monkey As Modified Dirt.

Every Great Advance In Natural Knowledge Has Involved The Absolute Rejection Of Authority.

Missionaries, Whether Of Philosophy Or Religion, Rarely Make Rapid Way, Unless Their Preachings Fall In With The Prepossessions Ofthe Multitude Of Shallow Thinkers, Or Can Be Made To Serve As A Stalking-horse For The Promotion Of The Practical Aims Of The Still Larger Multitude, Who Do Not Profess To Think Much, But Are Quite Certain They Want A Great Deal.