Seneca On the Humanity of Slaves

Seneca's letter on slavery, from www.stoics.com. There are so many good lines, it's hard to choose which part to quote:

Kindly remember that he whom you call your slave sprang from the same stock, is smiled upon by the same skies, and on equal terms with yourself breathes, lives, and dies. It is just as possible for you to see in him a free-born man as for him to see in you a slave.

And:

[The ancestors] established a holiday [Saturnalia] on which masters and slaves should eat together, - not as the only day for this custom, but as obligatory on that day in any case.