The death sentence is a necessary and efficacious means for the Church to attain its end when rebels act against it and disturbers of the ecclesiastical unity, especially obstinate heretics and heresiarchs, cannot be restrained by any other penalty from continuing to derange the ecclesiastical order and impelling others to all sorts of crime ... When the perversity of one or several is calculated to bring about the ruin of many of its children it is bound effectively to remove it, in such wise that if there be no other remedy for saving its people it can and must put these wicked men to death.
Pope Leo XIIINo one is so rich that he does not need another's help; no one so poor as not to be useful in some way to his fellow man; and the disposition to ask assistance from others with confidence and to grant it with kindness is part of our very nature.
Pope Leo XIIIBut the supreme teacher in the Church is the Roman Pontiff. Union of minds, therefore, requires, together with a perfect accord in the one faith, complete submission and obedience of will to the Church and to the Roman Pontiff, as to God Himself.
Pope Leo XIIIThe Eucharist is source and pledge of blessedness and glory, not for the soul alone, but for the body also.... In the frail and perishable body that divine Host, which is the immortal body of Christ, implants a principle of resurrection, a seed of immortality, which one day must germinate
Pope Leo XIIIFor when men know they are working on what belongs to them, they work with far greater eagerness and diligence. Nay, in a word, they learn to love the land cultivated by their own hands, whence they look not only for food but for some measure of abundance for themselves and their dependents. All can see how much this willing eagerness contributes to an abundance of produce and the wealth of a nation.
Pope Leo XIIINot only, in strict truth, was marriage instituted for the propagation of the human race, but also that the lives of husbands and wives might be made better and happier. This comes about in many ways: by their lightening each other's burdens through mutual help; by constant and faithful love; by having all their possessions in common; and by the heavenly grace which flows from the sacrament.
Pope Leo XIII