16 Furthermore, Venerable Brethren, as you well know, the Church has prescribed at all times that priests must prepare for their calling by means of a solid intellectual and spiritual education. Indeed, no one will doubt, especially in our time, that young people of all races and from all parts of the world are capable of absorbing such an education; this fact has already been clearly demonstrated. Without doubt, the formation to be given to this clergy must take into account the circumstances which obtain in different areas and nations. This extremely wise norm applies to all students for the priesthood; it is advisable that young seminarians never be "educated in places too far removed from human society," (28) because "once they step out into the world, they will have problems in dealing both with simple people and with intellectuals; this will often cause them to assume the wrong attitude toward the Christian population, or to regard the formation they received as a bad one." (29) Indeed, it is necessary that youths not only conform to the ideal of priestly spiritual perfection in everything, but also that they "gradually and prudently penetrate the mentality and feelings of the people" (30)-of the people, We repeat, whom they must enlight with the truth of the Gospel and lead to perfection of life, with the help of God's grace. Therefore, it is necessary that seminary superiors conform to this plan of training and education while yet welcoming those material and technical facilities which the genius of mankind has made the patrimony, as it were, of every civilization in order to insure an easier and better life and to preserve the bodily health and safety of mankind.
Source: Princeps Pastorum (Vatican.va)