Who was the Slave and who was the Free?

From Chrysostom, an early Greek Pastor:

"And consider both these points. Joseph was a slave but not a slave to men: wherefore even in slavery he was freer than all that are free. For instance, he yielded not to his mistress; yielded not to the purposes which she who possessed him desired. Again she was free; yet none ever so like a slave, courting and beseeching her own servant. But she prevailed not on him, who was free, to do what he would not. This then was not slavery; but it was liberty of the most exalted kind. For what impediment to virtue had he from his slavery? Let men hear, both slaves and free. Which was the slave? He that was entreated or she that did entreat? She that besought or he that despised her supplication?

"In fact, there are limits set to slaves by God Himself; and up to what point one ought to keep them, has also been determined, and to transgress them is wrong. Namely, when your master commands nothing which is unpleasing to God, it is right to follow and to obey; but no farther. For thus the slave becomes free. But if you go further, even though you are free you are become a slave. At least he intimates this, saying, 'Be not ye the servants of men'.”