The Republic by Plato Part 3 Page 91

Now, are not the best husbandmen those who are most devoted to husbandry?

Yes.

And as we are to have the best of guardians for our city, must they not be those who have most the character of guardians?

Yes.

And to this end they ought to be wise and efficient, and to have a special care of the State?

True.

And a man will be most likely to care about that which he loves?

To be sure.

And he will be most likely to love that which he regards as having the same interests with himself, and that of which the good or evil fortune is supposed by him at any time most to affect his own?