The best Quotations

Do you know the writers of the following quotations?

Quotation Every one in a crowd has the power to throw dirt; none out of ten have the inclination. - writer
Quotation The absolute yearning of one human body for another particular body and its indifference to substitutes is one of life's major mysteries. - writer
Quotation It is the constant fault and inseparable evil quality of ambition, that it never looks behind it. - writer
Quotation In this game, by trying to win; you automatically lose. - writer
Quotation True leadership must be for the benefit of the followers, not the enrichment of the leaders. - writer
Quotation Ideas that enter the mind under fire remain there securely and for ever. - writer