4 Now, therefore, having pondered long on this matter, so that, as far as lies in our power, we may endeavor to remedy such great evils, with humble and suppliant prayer we beg of God that He may deign in His goodness to show us some opportune way of healing these wounds. For He Himself, Who is the most loving Maker and Redeemer of all mankind, since He has given us this desire of laboring for the saving of the Indians, will also assuredly give us those things that conduce to this end. Meanwhile, it greatly consoles us to know that those who bear rule in these Republics are making every endeavor to remove this outstanding disgrace and this stain from their States; which endeavors, indeed, we cannot sufficiently praise and approve. Since, however, these regions are far from the seats of Government, and are for the most part not readily accessible, these human endeavors of the civil powers, whether from the craft of the criminals, who can speedily cross the frontiers, or through the inactivity or perfidy of the officials, often do little good, and sometimes come to nothing. But if the work of the Church is added to the work of the State, then at length the desired fruit shall be obtained in greater abundance.
Source: Lacrimabili Statu (Vatican.va)