I do not want medical men to discuss whether or not my work is valuable, because I know what it will do. I want them to tell me how best this new knowledge of rapidly restoring paralysed people to health and strength can be applied where it is needed.

Meaning: The saying promises vigorous beans after sowing in mud. Growing like wood gives its confidence in that method an exaggerated image of strength.

Meaning: Even an attentive observer cannot be assumed to notice every event. The cat-and-mouse image points to limits of oversight, without proving that an unnoticed action is harmless or acceptable.

Meaning: Another worker can often find something to improve in work already considered finished. The second barber’s remaining task suggests that completion depends on standards and perspective, without proving that earlier work was careless or endless correction is necessary.