Ad Apostolorum Principis §6

⁶ On that occasion We raised Our voice in sorrow, and, in Our Encyclical of January 18, 1952, Cupimus imprimis, rebuked the unjust attack. In that letter, for the sake of truth and conscious of Our duty, We declared that the Catholic Church is a stranger to no people on earth, much less hostile to any. With a mother's anxiety, she embraces all peoples in impartial charity. She seeks no earthly advantage but employs what powers she possesses to attract the souls of all men to seek what is eternal. We also stated that missionaries promote the interest of no particular nation; they come from every quarter of the earth and are united by a single love, God, and thus they seek and hope for nothing else save the spread of God's kingdom. Thus, it is clear that their work is neither without purpose nor harmful, but beneficent and necessary since it aids Chinese priests in their Christian apostolate.