This Book Considers The Important Twentieth Century Austrian Philosopher, Ludwig Wittgenstein, And His Conception Of His Work Entitledon Certainty, Wittgenstein Provides Not Only A Brilliant Solution To A Previously Intractable Philosophical Problem, But Also The Elements Of An Entirely New Way Of Approaching This And Similar Longstanding, Apparently Unresolvable, Problems. In On Certainty, He Re-conceives The Problem Of Radical Skepticism-the Claim That We Can Never Really Be Certain Of Anything Except The Contents Of Our Own Minds-as A Kind Of Philosophical Disease Of Thought. His Approach To The Problem, Which Is Emphasized In The Book, Is Similar To The Treatment Of Disease, Has Two Main Goals: (1) Bring About An Awareness In The Philosopher That This Kind Of Extreme Skepticism Is Not A Methodological Approach To Be Taken Seriously, And, With This Awareness, (2) An Attempt To Replace This Radical Skepticism With A Practical, Common Sense Framework.