They're specialists, and when they get done, you will enjoy clean chimneys without knowing anything about the construction of chimneys." "That's far-fetched, I am afraid." She looked at him curiously, and he felt a reproach in her gaze and manner.

But he was convinced of the rightness of his position.
"All thinkers on general subjects, the greatest minds in the world, in fact, rely on the specialists.

Herbert Spencer did that.

He generalized upon the findings of thousands of investigators.

He would have had to live a thousand lives in order to do it all himself.