Teenagers these days are out of control. They eat like pigs, they are disrespectful of adults, they interrupt and contradict their parents, and they terrorize their teachers.

Every man should be responsible to others, nor should anyone be allowed to do just as he pleases; for where absolute freedom is allowed there is nothing to restrain the evil which is inherent in every man. But the principle of responsibility secures that which is the greatest good in states; the right persons rule and are prevented from doing wrong, and the people have their due. It is evident that this is the best kind of democracy, and why? because the people are drawn from a certain class.

Therefore the good man ought to be a lover of self, since he will then both benefit himself by acting nobly and aid his fellows; but the bad man ought not to be a lover of self, since he will follow his base passions, and so injure both himself and his neighbors. With the bad man therefore, what he does is not in accord with what he ought to do, but the good man does what he ought, since intelligence always chooses for itself that which is best, and the good man obeys his intelligence.

It is well to be up before daybreak, for such habits contribute to health, wealth, and wisdom.

We must not feel a childish disgust at the investigations of the meaner animals. For there is something marvelous in all natural things.

I will not allow the Athenians to sin twice against philosophy.

And yet the true creator is necessity, which is the mother of invention.