The Republic by Plato Part 4 Page 18

Is that true? I said.

That is my belief, he replied.

Then, as I was saying, our youth should be trained from the first in a stricter system, for if amusements become lawless, and the youths themselves become lawless, they can never grow up into well-conducted and virtuous citizens.

Very true, he said.

And when they have made a good beginning in play, and by the help of music have gained the habit of good order, then this habit of order, in a manner how unlike the lawless play of the others! will accompany them in all their actions and be a principle of growth to them, and if there be any fallen places in the State will raise them up again.

Very true, he said.