Effort Supposes Resistance.

Every Work Of Science Great Enough To Be Well Remembered For A Few Generations Affords Some Exemplification Of The Defective State Of The Art Of Reasoning Of The Time When It Was Written; And Each Chief Step In Science Has Been A Lesson In Logic.

The Third Class Consists Of Men To Whom Nothing Seems Great But Reason. If Force Interests Them, It Is Not In Its Exertion, But In That It Has A Reason And A Law. For Men Of The First Class, Nature Is A Picture; For Men Of The Second Class, It Is An Opportunity; For Men Of The Third Class, It Is A Cosmos, So Admirable, That To Penetrate To Its Ways Seems To Them The Only Thing That Makes Life Worth Living. These Are The Men Whom We See Possessed By A Passion To Learn.

If An Opinion Can Eventually Go To The Determination Of A Practical Belief, It, In So Far, Becomes Itself A Practical Belief; And Every Proposition That Is Not Pure Metaphysical Jargon And Chatter Must Have Some Possible Bearing Upon Practice.

It Is Certain That The Only Hope Of Retroductive Reasoning Ever Reaching The Truth Is That There May Be Some Natural Tendency Toward An Agreement Between The Ideas Which Suggest Themselves To The Human Mind And Those Which Are Concerned In The Laws Of Nature.

Every Man Is Fully Satisfied That There Is Such A Thing As Truth, Or He Would Not Ask Any Question.