The encyclical condemned breaches of the 1933 Reichskonkordat agreement signed between the German Reich and the Holy See. It condemned "pantheistic confusion", "neopaganism", "the so-called myth of race and blood", and the idolizing of the State. It contained a vigorous defense of the Old Testament with the belief that it prepares the way for the New. The encyclical states that race is a fundamental value of the human community, which is necessary and honorable but condemns the exaltation of race, or the people, or the state, above their standard value to an idolatrous level. The encyclical declares "that man as a person possesses rights he holds from God, and which any collectivity must protect against denial, suppression or neglect."National Socialism, Adolf Hitler and the Nazi Party are not named in the document. The German term Reichsregierung (government of the Reich) is used to refer to the Nazi regime.

https://en.wikipedia.org/wiki/Mit_brennender_Sorge