424 The Faith of Our Fathers Transubstantiation a mystery, 292. Triumphs of the Church according to Gibbon, 53. Trent, Council of — great reformatory tribunal, 27; on sacred images, 198, et seq.; asserts doctrine of Purgatory, 210. Truth unchangeable, 12. Tyburn and Smithfield compared, 264. Tyndall on debt of science to the Church, 60. Unity of the Church, 5; heresy and schism opposed to, 5; required by Jesus Christ, 5; of faith required, 5; Jesus Christ prays for it, 5; prayer of Christ for, 5; an evidence of Christ's mission, 5; in government it is essential, 6; not found in Protestant sects, 9; found in Catholic Church alone, 10; Catholic, in what it consists, 10; of government and faith, 1 1 ; safeguard of government, 1 1 ; of faith not impaired by new doctrinal definitions, 1 1 ; of the Church maintained by supreme head, 98; Christian, endorsed, 119; implies recognition of pope's headship, 1 19. Unbaptized Infants — Church's teaching regarding, 273. Validity of the Pope's title to the papal states, 141.