The book of Revelation says that the martyrs “have washed their robes and made them white in the blood of the Lamb” (7:14). The first letter of John states that "if we walk in the light as he is in the light, then we have fellowship with one another, and the blood of his Son Jesus cleanses us from all sin" (1:7). Many saints, most notably St. Catherine of Siena, speak incessantly about the blood of Christ. They encourage [...]