Quality is not equal to test; it is achieved by putting development and testing into a blender and mixing them until one is indistinguishable from the other.
— http://googletesting.blogspot.com/2011/02/how-google-tests-software-part-three.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+blogspot/RLXA+(Google+Testing+Blog)&utm_content=Google+Reader