During the reformation, Young also forthrightly preached the doctrine of blood atonement, previously only briefly mentioned in public. Atonement for sin required a blood penalty, one paid with temple sacrifices in ancient Israel and then satisfied in traditional Christian theology by Christ's sacrifice. Young, however, warned that the death of Jesus would not absolve all sins. "[T]here are transgressors," he explained, "who if they knew themselves, and the only conditions upon which they can obtain forgiveness, would beg of their brethren to shed their blood, that the smoke thereof might ascend to God as an offering to appease the wrath that is kindled against them." . . . .Young's preaching terrified some of his listeners and made many others uncomfortable. "He made the Harts of many tremble," journalized the apostle Wilford Woodruff. . . . Even if Young primarily considered the doctrine a prod to repentance, several brutal acts of violence indicated the dangerous nature of his rhetoric.