Book: Through invisible barriers

... If everything invented and developed on the ground worked as flawlessly in the air, flight tests would not be necessary. And you and I would urgently have to change our profession.

Test pilots are often referred to as aircraft examiners. This is honorable and generally correct. But we must not forget that if a test pilot examines an airplane, then the airplane also examines a test pilot every time, in every flight. And he does it with all the severity. The cut off person will often never be able to try to correct the mark.