The best Quotations

Do you know the writers of the following quotations?

Quotation I look upon death to be as necessary to our constitution as sleep. We shall rise refreshed in the morning. - writer
Quotation We respond to a drama to that extent to which it corresponds to our dream life. - writer
Quotation Travel is glamorous only in retrospect. - writer
Quotation The trouble with our times is that the future is not what it used to be. - writer
Quotation Americans have mastered the art of being prosperous though broke. - writer
Quotation We begin to live when we have conceived life as tragedy. - writer