The best Quotations

Do you know the writers of the following quotations?

Quotation How can you buy or sell the sky, the warmth of the land? The idea is strange to us. If we do not own the freshness of the air and the sparkle of the water, how can you buy them? Every part of the earth is sacred to my people. - writer
Quotation She laughs at everything you say. Why? Because she has fine teeth. - writer
Quotation When the President does it, that means that it is not illegal. - writer
Quotation Mistakes are part of the dues one pays for a full life. - writer
Quotation The words that a father speaks to his children in the privacy of home are not heard by the world, but, as in whispering galleries, they are clearly heard at the end, and by posterity. - writer
Quotation What is originality? Undetected plagiarism. - writer