The best Quotations

Learning isn't a means to an end; it is an end in itself.
- Robert A. Heinlein

Do you know the writers of the following quotations?

Quotation Happiness is understanding that friendship is more precious than mere things, more precious than getting your own way, more precious than being in situations where true principles are not at stake. - writer
Quotation Great minds have purposes; others have wishes. - writer
Quotation It's not true that life is one damn thing after another; it's one damn thing over and over. - writer
Quotation The principle of all successful effort is to try to do not what is absolutely the best, but what is easily within our power, and suited for our temperament and condition. - writer
Quotation I want my friend to miss me as long as I miss him. - writer
Quotation Most dangerous is that temptation that doth good us on to sin to loving virtue. - writer