By Far The Best Proof Is Experience.

Pyrrhus, When His Friends Congratulated To Him His Victory Over The Romans Under Fabricius, But With Great Slaughter Of His Own Side, Said To Them, "yes; But If We Have Such Another Victory, We Are Undone."

Silence Is The Sleep That Nourishes Wisdom.

Observation And Experiment For Gathering Material, Induction And Deduction For Elaborating It: These Are Are Only Good Intellectual Tools.

They That Reverence To Much Old Times Are But A Scorn To The New.

Nothing Is To Be Feared But Fear.