The medical profession (is) a conspiracy to hide its own shortcomings. No doubt the same may be said of all professions. They are all conspiracies against the laity... (U)ntil there is a practicable alternative to blind trust in the doctor, the truth about the doctor is so terrible that we dare not face it.

You have learnt something. That always feels at first as if you had lost something.

Activity is the only road to knowledge.

[...] any fool can make a discovery. Every baby has to discover more in the first years of its life than Roger Bacon ever discovered in his laboratory.

People get nothing out of books but what they bring to them.

You have set up in New York Harbor a monstrous idol which you call Liberty. The only thing that remains to complete that monument is to put on its pedestal the inscription written by Dante on the gate of hell: All hope abandon ye who enter here.

When you prevent me from doing anything I want to do, that is persecution; when I prevent you from doing anything you want to do, that is law, order, and morals.