On 20th August, 1901, Pope Leo XIII issued his Encyclical Reputantiubus to the Archbishop of Olomouc, and the Archbishops and Bishops of Bohemia and Moravia on the Language Question in those Regions:
6. In this matter the holy clergy should surpass in example all others. Indeed, it is at variance with their office to mingle in such dissensions. If they should reside in places inhabited by people of different races or languages, unless they abstain from any appearance of contention, they may easily incur hatred and dislike from both sides. Nothing could be more detrimental to the exercise of their sacred function than this. The faithful, to be sure, should recognize in fact and practice that the ministers of the Church are concerned only with the eternal affairs of souls and do not seek what is theirs, but only what is Christ's.
7. If, then, it is well known to all alike that the disciples of Christ are recognized by the love that they have for one another, the holy clergy must observe this same love mutually among themselves far more. For not only are they thought, and deservedly so, to have drunk much more deeply from the charity of Christ, but also because each one of them, in addressing the faithful, ought to be able to use the words of the Apostle, "Be imitators of me, as I am of Christ." [Phil iii.17]
8. We can easily admit that this is very difficult in practice, unless the elements of discord are erased from their souls at an early time when they, who aspire to the clerical state, are formed in our seminaries. Therefore, you must diligently see to it that the students in seminaries early learn to love one another in a fraternal love and from a genuine heart, as those born not from a corruptible seed but an incorruptible one through the word of the living God. [Pt 1.22 f.] Should arguments break out, restrain them strongly and do not allow them to persist in any way; thus those who are destined for the clergy, if they cannot be of one language because of different places of origin, still may certainly be of one heart and one spirit.
9. From this union of wills, indeed, which must be conspicuous in the clerical order, as we have already intimated, this advantage among others will follow: that the ministers of the sacraments will more efficaciously warn the faithful not to exceed the limits in preserving and vindicating the rights proper to each race, or by excessive partisanship not to do violence to justice and overlook the common advantages of the state. For we think that this, according to the circumstances of your various regions, should be the principal task of priests, to exhort the faithful, in season and out, to love one another; they should warn them constantly that he is not worthy of the name of Christian who does not fulfill in spirit and action the new command given by Christ that we love one another as He has loved us.