How justly, then, I die, let them look to who have condemned me. It is sufficient for me that it is God's will: I plead not for myself, (I came hither to suffer,) but for you poor persecuted catholics, whom I leave behind me. Heretofore liberty of conscience was pretended as a cause of war; and it was held a reasonable proposition that all the natives should enjoy it, who" should be found to behave themselves as obedient and true subjects. This being so, why should their conscientious acting and governing themselves according to the faith received from their ancestors, involve them more than all the rest in that universal guilt? which conscientiousness is the very reason that clears others, and renders them innocent. It has pleased God to take the sword out of the king's hand, and put it in the protector's. Let him remember that he is to administer justice indifferently, and without exception of persons. For there is no exception of persons with God, whom we ought to resemble. If any catholics work against the present government, let them suffer; but why should all the rest who are guitless, (unless conscience be their guilt,) be made partakers in the promiscuous punishment with the greatest malefactors?
(You can read the full speech attributed to Southworth here.) At this point he was pretty much told to hurry it up, so he ended with prayer and was hanged, drawn, and quartered along with a handful of counterfeiters; he was about sixty-two years old. If I recall correctly, he was the last person in England to be executed for being a priest until the Popish Plot scare stirred up by Titus Oates (the anti-priest law continued to exist but was not enforced for quite some time), and is the only English Catholic martyr under Cromwell (most Catholic martyrs under Cromwell were Irish).