Education is in the first place instruction in what is necessary, and then in what is changing and inconstant. The youth is introduced to nature, and the sway of laws is everywhere pointed out to him; followed by an explanation of the laws of ordinary society. Even at this early stage the question will arise: was it absolutely necessary that this should have been so? He gradually comes to need history to ascertain how these things have been brought about. He learns at the same time, however, that they may be changed into something else. What is the extent of man's power over things? This is the question in connection with all education. To show how things may become other than what they are we may, for example, point to the Greeks. We need the Romans to show how things became what they were.