The Only Thing That I Know, Is

Even The Mind Depends So Much On Temperament And The Disposition Of One's Bodily Organs That, If It Is Possible To Find A Way To Make People Generally More Wise And More Skilful Than They Have Been In The Past, I Believe That We Should Look For It In Medicine. It Is True That Medicine As It Is Currently Practiced Contains Little Of Much Use.

I Hope That Posterity Will Judge Me Kindly, Not Only As To The Things Which I Have Explained, But Also To Those Which I Have Intentionally Omitted So As To Leave To Others The Pleasure Of Discovery.

If I Simply Refrain From Making A Judgment In Cases Where I Do Not Perceive The Truth With Sufficient Clarity And Distinctness, Then It Is Clear That I Am Behaving Correctly And Avoiding Error.

For To Be Possessed Of A Vigorous Mind Is Not Enough; The Prime Requisite Is Rightly To Apply It.

I Am Thinking, Therefore I Exist. (...) I Was A Substance Whose Whole Essence Or Nature Is Solely To Think, And Which Does Not Require Any Place, Or Depend On Any Material Thing, In Order To Exist. Accordingly This 'i' - That Is, The Soul By Which I Am What I Am - Is Entirely Distinct From The Body, And Indeed Is Easier To Know Than The Body, And Would Not Fail To Be Whatever It Is, Even If The Body Did Not Exist.