The best Quotations

The greatest events occur without intention playing any part in them; chance makes good mistakes and undoes the most carefully planned undertaking. the world's greatest events are not produced, they happen.
- G. C. Lichtenberg

Do you know the writers of the following quotations?

Quotation Invention strictly speaking, is little more than a new combination of those images which have been previously gathered and deposited in the memory; nothing can come from nothing. - writer
Quotation Sometimes the best, and only effective, way to kill an idea is to put it into practice. - writer
Quotation The keynote of American civilization is a sort of warm-hearted vulgarity. The Americans have none of the irony of the English, none of their cool poise, none of their manner. But they do have friendliness. Where an Englishman would give you his card, an American would very likely give you his shirt. - writer
Quotation An ambassador is an honest person sent to lie abroad for their country. - writer
Quotation After all, the ultimate goal of all research is not objectivity, but truth. - writer
Quotation There is hardly anybody good for everything, and there is scarcely anybody who is absolutely good for nothing. - writer