Plato is my friend, but truth is a better friend.

At his best, man is the noblest of all animals; separated from law and justice he is the worst.

All communication must lead to change

True happiness comes from gaining insight and growing into your best possible self. Otherwise all you're having is immediate gratification pleasure, which is fleeting and doesn't grow you as a person.

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

In educating the young we steer them by the rudders of pleasure and pain

Tools may be animate as well as inanimate; for instance, a ship's captain uses a lifeless rudder, but a living man for watch; for a servant is, from the point of view of his craft, categorized as one of its tools. So any piece of property can be regarded as a tool enabling a man to live, and his property is an assemblage of such tools; a slave is a sort of living piece of property; and like any other servant is a tool in charge of other tools.