The best Quotations

I think a compliment ought to always precede a complaint, where one is possible, because it softens resentment and insures for the complaint a courteous and gentle reception.
- Mark Twain

Do you know the writers of the following quotations?

Quotation Great art is never produced for its own sake. It is too difficult to be worth the effort. - writer
Quotation Statistics are no substitute for judgment. - writer
Quotation It is the American vice, the democratic disease which expresses its tyranny by reducing everything unique to the level of the herd. - writer
Quotation What is freedom? Freedom is the right to choose: the right to create for oneself the alternatives of choice. - writer
Quotation But remember please, the Law by which we live, we are not built to comprehend a lie, we can neither love nor pity nor forgive. If you make a slip in handling us you die. - writer
Quotation Friendship is constant in all other things save in the office and affairs of love. - writer