BTW There's no way I can read that all now, but Tertullian is widely acknowledged by us to have gone off the rails.
That's important to me because while he started out good, and even funny, he's kind of like Calvin in his biting wit, and he ends up renouncing anything like what I would call reason.
So I'm not surprised that he thought widows ought not to marry. When people go off the rails they often want others to be as miserable as they are.
Origen is also a complicated figure in the history of the Church. If one had a couple of weeks to spare, he could start with this:
http://www.newadvent.org/cathen/11306b.htm