44 In dealing with these matters, We have not forgotten you, most beloved sons, who have already obeyed that command of the divine Master: "Put out into the deep." We extend Our goodwill to you, who are already laboring and fatigued in the middle of the sea, striving to extend the boundaries of the Kingdom of God. And having lifted up your spirit, We address to one and all of you the words of the Apostle of the gentiles: "Use all care to present thyself to God as a man approved, a worker that need not be ashamed." "Be thou an example to the faithful in speech, in conduct, in charity, in faith, in chastity." And We also desire with the Apostle to suggest to you the necessary aids by which these exhortations may be put into action. We commend especially this most effective counsel: "Pursue righteousness." For if divine grace fills your soul, all the things which surround you will not be able to influence you, seeing that the Kingdom of God is ruled by this law: "The Kingdom of heaven is like leaven, which a woman took and buried in three measures of flour, until all of it was leavened."
Source: Saeculo Exeunte Octavo (Vatican.va)