The best Quotations

Art is an invention of aesthetics, which in turn is an invention of philosophers. what we call art is a game.
- Octavio Paz

Do you know the writers of the following quotations?

Quotation Whatever games are played with us, we must play no games with ourselves. - writer
Quotation Please give me some good advice in your next letter. I promise not to follow it. - writer
Quotation Whenever the cause of the people is entrusted to professors, it is lost. - writer
Quotation Get well cards have become so humorous that if you don't get sick you're missing half the fun. - writer
Quotation I don't think anything is unrealistic if you believe you can do it. - writer
Quotation Power never takes a step back except in the face of more power. - writer