I Think; Therefore I Am.

Thus Each Truth Discovered Was A Rule Available In The Discovery Of Subsequent Ones.

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.

Science Is Practical Philosophy.

Although My Knowledge Grows More And More, Nevertheless I Do Not For That Reason Believe That It Can Ever Be Actually Infinite, Since It Can Never Reach A Point So High That It Will Be Unable To Attain Any Greater Increase.

Reason Is Nothing Without Imagination.