The best Quotations

Do you know the writers of the following quotations?

Quotation You cannot be a hero without being a coward. - writer
Quotation Like the British Constitution, she owes her success in practice to her inconsistencies in principle. - writer
Quotation For every promise, there is price to pay. - writer
Quotation Buddhism is not a creed, it is a doubt. - writer
Quotation He is great who confers the most benefits. - writer
Quotation I sit on a man's back, choking him and making him carry me, and yet assure myself and others that I am very sorry for him and wish to ease his lot by all possible means - except by getting off his back. - writer