By divine mandate the interpreter and guardian of the Scriptures, and the depository of Sacred Tradition living within her, the Church alone is the entrance to salvation: She alone, by herself, and under the protection and guidance of the Holy Spirit, is the source of truth.
Pope Pius XIISome say they are not bound by the doctrine which teaches that the Mystical Body of Christ and the Roman Catholic Church are one and the same thing. Some reduce to a meaningless formula the necessity of belonging to the true Church in order to gain eternal salvation. Others finally belittle the reasonable character of the credibility of Christian Faith. These and like errors, it is clear, have crept in among certain of our sons who are deceived by imprudent zeal for souls or by false science.
Pope Pius XIILet no Christian therefore, whether philosopher or theologian, embrace eagerly and lightly whatever novelty happens to be thought up from day to day, but rather let him weigh it with painstaking care and a balanced judgment, lest he lose or corrupt the truth he already has, with grave danger and damage to his faith.
Pope Pius XIIThe good of our soul is more important than that of our body; and we have to prefer the spiritual welfare of our neighbor to our bodily comforts. . . If a certain kind of dress constitutes a grave and proximate occasion of sin, and endangers the salvation of your soul and others, it is your duty to give it up.
Pope Pius XII[Parental] authority must be tempered...with loving kindness and patient encouragement. To temper authority with kindness is to triumph in the struggle which belongs to your duty as parents...All those who would advantageously rule over others, must as an essential element, first dominate themselves, their passions, their impressions.
Pope Pius XII