Since the general or prevailing opinion on any subject is rarely or never the whole truth, it is only by the collision of adverse opinion that the remainder of the truth has any chance of being supplied.
John Stuart MillIt is not because men's desires are strong that they act ill; it is because their consciences are weak.
John Stuart MillA cultivated mind is one to which the fountains of knowledge have been opened, and which has been taught, in any tolerable degree, to exercise its faculties.
John Stuart Mill