On 4th October, 1903, Pope St. Pius X issued his Encyclical E Supremi on the restoration of all things in Christ:
11. This being so, Venerable Brethren, of what nature and magnitude is the care that must be taken by you in forming the clergy to holiness! All other tasks must yield to this one. Wherefore the chief part of your diligence will be directed to governing and ordering your seminaries aright so that they may flourish equally in the soundness of their teaching and in the spotlessness of their morals. Regard your seminary as the delight of your hearts, and neglect on its behalf none of those provisions which the Council of Trent has with admirable forethought prescribed. And when the time comes for promoting the youthful candidates to holy orders, ah! do not forget what Paul wrote to Timothy: "Impose not hands lightly upon any man" (I. Tim. v., 22), bearing carefully in mind that as a general rule the faithful will be such as are those whom you call to the priesthood. Do not then pay heed to private interests of any kind, but have at heart only God and the Church and the eternal welfare of souls so that, as the Apostle admonishes, "you may not be partakers of the sins of others" (Ibid.). Then again be not lacking in solicitude for young priests who have just left the seminary. From the bottom of Our heart, We urge you to bring them often close to your breast, which should burn with celestial fire -- kindle them, inflame them, so that they may aspire solely after God and the salvation of souls. Rest assured, Venerable Brethren, that We on Our side will use the greatest diligence to prevent the members of the clergy from being drawn to the snares of a certain new and fallacious science, which savoureth not of Christ, but with masked and cunning arguments strives to open the door to the errors of rationalism and semi-rationalism; against which the Apostle warned Timothy to be on his guard, when he wrote: "Keep that which is committed to thy trust, avoiding the profane novelties of words, and oppositions of knowledge falsely so called which some promising have erred concerning the faith" (I. Tim. vi., 20 s.). This does not prevent Us from esteeming worthy of praise those young priests who dedicated themselves to useful studies in every branch of learning the better to prepare themselves to defend the truth and to refute the calumnies of the enemies of the faith. Yet We cannot conceal, nay, We proclaim in the most open manner possible that Our preference is, and ever will be, for those who, while cultivating ecclesiastical and literary erudition, dedicate themselves more closely to the welfare of souls through the exercise of those ministries proper to a priest jealous of the divine glory. "It is a great grief and a continual sorrow to our heart" (Rom. ix., 2) to find Jeremiah's lamentation applicable to our times: "The little ones asked for bread, and there was none to break it to them" (Lam. iv., 4). For there are not lacking among the clergy those who adapt themselves according to their bent to works of more apparent than real solidity -- but not so numerous perhaps are those who, after the example of Christ, take to themselves the words of the Prophet: "The Spirit of the Lord hath anointed me, hath sent me to evangelize the poor, to heal the contrite of heart, to announce freedom to the captive, and sight to the blind" (Luke iv., 18-19).