Source: https://www.bertha-dudde.org/en/proclamation/2195
2195 Spiritual communications must be related to christian teaching....
December 27, 1941: Book 31
The spirit from God only imparts spiritual truths, and therefore whatever is revealed to people through the working of the spirit can be unconditionally accepted as truth. As soon as earthly events are mentioned they always have to be in a certain connection with the spiritual development of men, therefore these earthly events have to have such an effect that they can serve the higher development of the soul. Then such messages from the spiritual kingdom are likewise to be believed and they are to be recognized as divine spiritual work. Spiritual impartations always have to be related to the christian teaching, then they have emerged from the kingdom of light and been revealed to it for the benefit of humanity. And this is of utmost importance for you, that you find the connection between these proclamations and the word which the lord taught on earth.... He is now giving out the same again in a different form. The lord has announced on earth that the earth will be afflicted, that trouble and tribulation will come upon it and that not one stone shall be left upon another. And so He must announce the same again to people and let His announcement be followed by action. What the lord has said must be fulfilled, otherwise His word would not be truth. It must fulfil itself because the spiritual development of people is connected with it. Thus a revelation can be accepted as divine without hesitation as soon as it aims to ennoble people, even though it deals with earthly events, for God wants to prove to people through such events the truth of what He taught on earth and still teaches. He wants to provide them with a little proof so that people will easily find faith or strengthen their weak faith, for a person will only believe if he has proof, but otherwise he cannot be given proof, i.e., the spiritual truths imparted to a person can only be revealed to him after the death of his body, thus he would never have proof on earth of the truths which are imparted to him spiritually. And God now comes to the human being's aid by giving him the opportunity to test the truthfulness of His divine word, for this will reveal that everything the lord has said in His way of life will come true, so that the realization of truth will contribute towards leading earthly life in accordance with divine will, so that the soul's higher development will be taken into account, so that the human being will mature within himself and do everything that contributes towards the transformation of his soul....
Amen
Translated by Doris Boekers