to tend; in the unity of the means for attaining this end... in the unity of the redemption wrought by Christ for all. This divine law of solidarity and charity assures that all men are truly brethren, without excluding the rich variety of persons, cultures, and societies. Notes References Passelecq, Georges; Suchecky, Bernard. L’Encyclique Cachée de Pie XI: Une occasion manqué de l’Église face a l’antisemitisme. Editions La Decouverte, Paris 1995. (engl) The Hidden Encyclical of Pius XI Harcourt, Brace, and Co., 1997. Encyclical Summi Pontificatus on the Vatican website External links Humani Generis Unitas draft of a section as of 1938 Pius XI and the mystery of the disappeared encyclical (YouTube video, original Italian, with English subtitles, duration 04:38) Late Modern Christian anti-Judaism Documents of Pope Pius XI Catholicism and Judaism 1939 documents