This is one of my favorite quotes of all times, and I completely understand, why I never heard it before I came to buisiness school.

It completelly inverts the common narative about constructive criticism. Literally every single line of criticism is constructive, but it takes a great mind to extract the information out of it. If someone said: I just need a cilinder with repeated explosions, that will rotate wheels of a self-propeling vehicle, why do you think such a person would need your help to begin with?