28 Prayer, then, and penance are the two potent inspirations sent to us at this time by God, that we may lead back to Him mankind that has gone astray and wanders about without a guide: they are the inspirations that will dispel and remedy the first and principal cause of every form of disturbance and rebellion, the revolt of man against God. But the peoples themselves are called upon to make up their minds to a definite choice: either they entrust themselves to these benevolent and beneficent inspirations and are converted, humble and repentant, to the Lord and the Father of mercies, or they hand over themselves and what little remains of happiness on earth to the mercy of the enemy of God, to the spirit of vengeance and destruction.
Source: Caritate Christi Compulsi (Vatican.va)