25 It need scarcely be added that the greater the number of students you select for this training (there is need of greater numbers) the greater will be the expense. Do not lose heart because of this fact, but have confidence in the most loving Savior of men to Whose Providence We must look to find ways and means whereby the generosity of Catholics shall be stimulated so that there may come to the Holy See the increased funds required to aid more adequately such worthy enterprises. If each of you must do all he can to obtain as large a number as possible of native ecclesiastical students, you must also strive to mold and form them in that sanctity which is becoming to the priestly life and in the true spirit of the apostolate. Filled with these virtues and with zeal for the conversion of their brothers, they should be ready even to lay down their lives for the salvation of the people of their own tribe or nation. It is also important that simultaneously with this priestly formation these seminarians receive a scientific education both in the sacred and profane sciences. This education should follow the most approved methods. The course of study should not be unduly shortened or curtailed in any of its important features. The students as a matter of fact should follow the general accepted course of studies. Have no fear that if in the seminary you educate subjects conspicuous for the integrity and purity of their lives, men well prepared for the work of the sacred ministry and skilled teachers of the law of God, that you will not have turned out men who will not only attract the attention of the leading and learned men of their own country but also priests who will be destined one day to govern parishes and dioceses which shall be erected when it pleases God, and all this with the prospect of lasting gain for the Church.
Source: Rerum Ecclesiae (Vatican.va)