64 And so We beseech you, Venerable Brothers, to take this faith, which means nothing less than maintaining complete fidelity to the words of Christ and the Apostles, and preserve it in its purity and integrity among the people entrusted to your care and vigilance, with all false and pernicious opinions being completely rejected; and We beseech you to foster devotion to the Eucharist, which should be the focal point and goal of all other forms of devotion.
Source: Mysterium Fidei (Vatican.va)