He Who Hid Well, Lived Well.

But I Cannot Forget That, At Other Times I Have Been Deceived In Sleep By Similar Illusions; And, Attentively Considering Those Cases, I Perceive So Clearly That There Exist No Certain Marks By Which The State Of Waking Can Ever Be Distinguished From Sleep, That I Feel Greatly Astonished; And In Amazement I Almost Persuade Myself That I Am Now Dreaming.

De Omnibus Dubitandum

If You Would Be A Real Seeker After Truth, It Is Necessary That At Least Once In Your Life You Doubt, As Far As Possible, All Things.

The Only Thing We Have Power Over In The Universe Is Our Own Thoughts.

Now Therefore, That My Mind Is Free From All Cares, And That I Have Obtained For Myself Assured Leisure In Peaceful Solitude, I Shall Apply Myself Seriously And Freely To The General Destruction Of All My Former Opinions.