Economy Does Not Lie In Sparing Money,

It Does Not Matter How Many Tumbles You Have In This Life, So Long As You Do Not Get Dirty When You Tumble; It Is Only The People Who Have To Stop To Be Washed And Made Clean, Who Must Necessarily Lose The Race. And I Can Assure You That There Is The Greatest Practical Benefit In Making A Few Failures Early In Life. You Learn That Which Is Of Inestimable Importance

Veracity Is The Heart Of Morality.

And When You Cannot Prove That People Are Wrong, But Only That They Are Absurd, The Best Course Is To Let Them Alone.

The Scientific Imagination Always Restrains Itself Within The Limits Of Probability.

Trust A Witness In All Matters In Which Neither His Self-interest, His Passions, His Prejudices, Nor The Love Of The Marvellous Is Strongly Concerned. When They Are Involved, Require Corroborative Evidence In Exact Proportion To The Contravention Of Probability By The Thing Testified.