The best Quotations

In government offices which are sensitive to the vehemence and passion of mass sentiment public men have no sure tenure. they are in effect perpetual office seekers, always on trial for their political lives, always required to court their restless constituents.
- Walter Lippmann

Do you know the writers of the following quotations?

Quotation If you are the master be sometimes blind, if you are the servant be sometimes deaf. - writer
Quotation A man's life is interesting primarily when he has failed - I well know. For it's a sign that he tried to surpass himself. - writer
Quotation It all depends on whether you have things, or they have you. - writer
Quotation The things we know best are the things we haven't been taught. - writer
Quotation The word which gives the key to the national vice is waste. And people who are wasteful are not wise, neither can they remain young and vigorous. In order to transmute energy to higher and more subtle levels one must first conserve it. - writer
Quotation It is quality rather than quantity that matters. - writer