Once we know our weaknesses they cease to do us any harm.
If all mankind were suddenly to practice honesty, many thousands of people would be sure to starve.
Ask yourself always: how can this be done better?
As I take up my pen I feel myself so full, so equal to my subject, and see my book so clearly before me in embryo, I would almost like to try to say it all in a single word.
Sickness is mankind's greatest defect.
To err is human also in so far as animals seldom or never err, or at least only the cleverest of them do so.