The best Quotations

May we agree that private life is irrelevant? multiple, mixed, ambiguous at best - out of it we try to fashion the crystal clear, the singular, the absolute, and that is what is relevant; that is what matters.
- May Sarton

Do you know the writers of the following quotations?

Quotation Slavery is founded on the selfishness of man's nature - opposition to it on his love of justice. These principles are in eternal antagonism; and when brought into collision so fiercely as slavery extension brings them, shocks and throes and convulsions must ceaselessly follow. - writer
Quotation I who have been involved with all styles of painting can assure you that the only things that fluctuate are the waves of fashion which carry the snobs and speculators; the number of true connoisseurs remains more or less the same. - writer
Quotation It was Greek to me. - writer
Quotation Life is divided up into the horrible and the miserable. - writer
Quotation Because impudence is a vice, it does not follow that modesty is a virtue; it is built upon shame, a passion in our nature, and may be either good or bad according to the actions performed from that motive. - writer
Quotation A short absence is the safest. - writer