The best Quotations

Do you know the writers of the following quotations?

Quotation He is poor indeed that can promise nothing. - writer
Quotation It is the bright day that brings forth the adder, and that craves wary walking. - writer
Quotation The less you open your heart to others, the more your heart suffers. - writer
Quotation Good communication is as stimulating as black coffee, and just as hard to sleep after. - writer
Quotation My neighbor doesn't want to be loved as much as he wants to be envied. - writer
Quotation Absence from whom we love is worse than death, and frustrates hope severer than despair. - writer