What has not been examined impartially has not been well examined. Skepticism is therefore the first step towards truth.
Denis DiderotThe enjoyment of freedom which could be exercised without any motivation would be the real hallmark of a maniac.
Denis DiderotYou live as if you were destined to live forever, no thought of your frailty ever enters your head, of how much time has already gone by you take no heed. You squander time as if you drew from a full and abundant supply, so all the while that day which you bestow on some person or thing is perhaps your last. You have all the fears of mortals and all the desires of immortals… What foolish forgetfulness of mortality to defer wise resolutions to the fiftieth or sixtieth year, and to intend to begin life at a point to which few have attained.
Denis Diderot