95 The peace, then, which we must seek, which we must strive to achieve with all the means at our disposal, must—as We have said—make no concessions to error, must compromise in no way with proponents of falsehood; it must make no concessions to vice; it must discourage all discord. Those who adhere to this peace must be ready to renounce their own interests and advantages for the sake of truth and justice, according to the words: "Seek first the kingdom of God and his justice." (45)
Source: Ad Petri Cathedram (Vatican.va)