To Be Is To Be Perceived

How Often Must I Repeat, That I Know Or Am Conscious Of My Own Being; And That I Myself Am Not My Ideas, But Somewhat Else, A Thinking, Active Principle That Perceives, Knows, Wills, And Operates About Ideas?

But The Velocities Of The Velocities - The Second, Third, Fourth, And Fifth Velocities, Etc. - Exceed, If I Mistake Not, All Human Understanding.

The Same Principles Which At First View Lead To Skepticism, Pursued To A Certain Point, Bring Men Back To Common Sense.

What Is Mind? No Matter. What Is Matter? Never Mind.

If What You Mean By The Word "matter" Be Only The Unknown Support Of Unknown Qualities, It Is No Matter Whether There Is Such A Thing Or No, Since It No Way Concerns Us; And I Do Not See The Advantage There Is In Disputing About What We Know Not What, And We Know Not Why.