The best Quotations

If i am anything, which i highly doubt, i have made myself so by hard work.
- Sir Isaac Newton

Do you know the writers of the following quotations?

Quotation Reason is a supple nymph, and slippery as a fish by nature. She had as leave give her kiss to an absurdity any day, as to syllogistic truth. The absurdity may turn out truer. - writer
Quotation A work of art that contains theories is like an object on which the price tag has been left. - writer
Quotation He that does good to another does good also to himself. - writer
Quotation Art is a form of catharsis. - writer
Quotation As one may bring himself to believe almost anything he is inclined to believe, it makes all the difference whether we begin or end with the inquiry, ''What is truth?'' - writer
Quotation Books succeed, and lives fail. - writer