Euthanasia in its modern sense has always been strongly opposed in the Judeo-Christian tradition. Thomas Aquinas opposed both and argued that the practice of euthanasia contradicted our natural human instincts of survival, as did Francois Ranchin (1565–1641), a French physician and professor of medicine, and Michael Boudewijns (1601–1681), a physician and teacher. Other voices argued for euthanasia, such as John Donne in 1624, and euthanasia continued to be practised. In 1678, the publication of Caspar Questel's "De pulvinari morientibus non-subtrahend", (""On the pillow of which the dying should not be deprived""), initiated debate on the topic. Questel described various customs which were employed at the time to hasten the death of the dying, (including the sudden removal of a pillow, which was believed to accelerate death), and argued against their use, as doing so was "against the laws of God and Nature". This view was shared by others who followed, including Philipp Jakob Spener, Veit Riedlin and Johann Georg Krünitz. Despite opposition, euthanasia continued to be practised, involving techniques such as bleeding, suffocation, and removing people from their beds to be placed on the cold ground.