Rorate Caeli

I have fought a good fight,
I have finished my course,
I have kept the Faith.

We, as a newly ordained priest, then just empowered to recite "Introibo ad altare Dei" (Psalm xiii. 4), hailed the Encyclical Annum Sacrum [on the consecration of the world to the Sacred Heart] with genuine approval, enthusiasm and delight as a message from heaven. ... It is only natural, then, that We should today feel profoundly grateful to Providence for having designed that the first year of Our Pontificate should be associated with a memory so precious and so dear of Our first year of priesthood, and that We should take the opportunity of paying homage to the King of kings and Lord of lords (I Timothy vi. 15; Apocalypse xix. 6) as a kind of Introit prayer to Our Pontificate, in the spirit of Our renowned predecessor and in the faithful accomplishment of his designs, and that, in fine, We should make of it the alpha and omega of Our aims, of Our hopes, of Our teaching, of Our activity, of Our patience and of Our sufferings, by consecrating them all to the spread of the Kingdom of Christ. ...
As Vicar of Him Who in a decisive hour pronounced before the highest earthly authority of that day, the great words: "For this was I born, and for this came I into the world; that I should give testimony to the truth. Every one that is of the truth, hearest My voice" (Saint John xviii. 37), We feel We owe no greater debt to Our office and to Our time than to testify to the truth with Apostolic firmness: "to give testimony to the truth." This duty necessarily entails the exposition and confutation of errors and human faults; for these must be made known before it is possible to tend and to heal them. "You shall know the truth and the truth shall make you free" (Saint John viii. 32).

In the fulfillment of this, Our duty, we shall not let Ourselves be influenced by earthly considerations nor be held back by mistrust or opposition, by rebuffs or lack of appreciation of Our words, nor yet by fear of misconceptions and misinterpretations. We shall fulfill Our duty, animated ever with that paternal charity which, while it suffers from the evils which afflict Our children, at the same time points out to them the remedy; We shall strive to imitate the Divine Model of shepherds, Jesus, the Good Shepherd, Who is light as well as love: "Doing the truth in charity" (Ephesians iv. 15).

Pius XII
Summi Pontificatus (1939)
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Pius XII kept his promise, doing the Truth in Charity.