12 On the other hand, the spiritual formation and the interior life fostered in these your collaborators, will put them on their guard against dangers and possible deviations. Keeping in mind the ultimate aim of Catholic Action, which is the sanctification of souls, according to the Gospel precept: See ye first the Kingdom of God ( Luke xii. 31), you will not run the risk of sacrificing principles for immediate and secondary ends, and that supreme end will never be forgotten to which must be subordinated even social and economic works and charitable undertakings. Our Lord Jesus Christ taught us this with example; because when in the ineffable tenderness of His Divine Heart which makes Him exclaim: I have compassion on the multitude . . . And if I shall send them away fasting to their home, they will faint in the way ( Mark viii. 2 to 3), He healed the infirmities of the body and came to the assistance of temporal needs, He had the supreme end of His mission always in view, that is, the glory of His Father and the eternal salvation of souls.
Source: Firmissimam Constantiam (Vatican.va)