Cicero: “For they are like lamps: unless you feed them with oil, they too go out from old age.”

For we are all attracted and drawn to a zeal for learning and knowing; and we think it glorious to excel therein, while we count it base and immoral to fall into error, to wander from the truth, to be ignorant, to be led astray.

To this passion for discovering truth there is added a hungering, as it were, for independence, so that a mind well-moulded by Nature is unwilling to be subject to anybody save one who gives rules of conduct or is a teacher of truth or…

There are, on the other hand, two kinds of injustice--the one, on the part of those who inflict wrong, the other on the part of those who, when they can, do not shield from wrong those upon whom it is being inflicted.

But while they steer clear of the one kind of injustice, they fall into the other: they are traitors to social life, for they contribute to it none of their interest, none of their effort, none of their means.