Almost every famous person at least once in their life said something that was remembered by the society, and considered meaningful, important or just funny. Those quotations can be mentioned in various situations. Often they are used in speeches or in a humorous way. In order to find some of them grub around.
Richard dawkings:
Date: February 12, 2008
"We are survival machines - robot vehicles blindly programmed to preserve the selfish molecules known as genes.
Personally I rather look forward to a computer program winning the world [chess] championship. Humanity needs a lesson in humility.