71 Let Superiors of seminaries, together with the spiritual directors and confessors, reflect how weighty a responsibility they assume before God, before the Church, and before the youths themselves, if they do not take all means at their disposal to avoid a false step . We declare too, that confessors and spiritual directors could also be responsible for such a grave error; and not indeed because they can take any outward action, since that is severely forbidden them by their most delicate office itself, and often also by the inviolable sacramental seal; but because they can have a great influence on the souls of the individual students, and with paternal firmness they should guide each according to his spiritual needs. Should the superiors, for whatever reason, not take steps or show themselves weak, then especially should confessors and spiritual directors admonish the unsuited and unworthy, without any regard to human consideration, of their obligation to retire while yet there is time; in this they should keep to the most secure opinion, which in this case is the one most in favor of the penitent, for it saves him from a step which could be for him eternally fatal. If somethimes they should not see so clearly that an obligation is to be imposed, let them, at least, use all the authority which springs from their office and the paternal affection they have for their spiritual sons, and so induce those who have not the necessary fitness to retire of their own free will. Let confessors remember the words of St. Alphonsus Liguori on a similar matter: "In general . . . in such cases the more severity the confessor uses with his penitents, the more will he help them towards their salvation; and on the contrary, the more cruel will he be the more he is benign." St. Thomas of Villanova called such over-kind confessors: Impie pios - "wickedly kind"; "such charity is contrary to charity."
Source: Ad Catholici Sacerdotii (Vatican.va)