John xix. 34.  Cf. Cat. iii. 10.  Origen (In Lib. Judic. Hom. vii. § 2):  “It is the Baptism of blood alone that can render us purer than the Baptism of water has done.”  Cf. Origen (in Ev. Matt. Tom. xvi. 6):  “If Baptism promises remission of sins, as we have received concerning Baptism in water and the Spirit, and if one who has endured the Baptism of Martyrdom receives remission of sins, then with good reason martyrdom may be called a Baptism.”  For a summary of the “Patristic Interpretation” of the passage, see Bp. Westcott, Speaker’s Commentary.)