"They who are in love with practice without theory are like the sailor who boards ship without rudder and compass and never knows where he may cast."

"The credulity of dupes is as inexhaustible as the invention of knaves."

"Difficulty is a severe instructor, always at our elbow."

"The only sure way to prevent the abuse of power is to limit it."

"The effect of liberty to individuals is, that they may do what they please: we ought to see what it will please them to do, before we risk congratulations."