1) the development and dissemination of humanistic ideas and scientific knowledge led to the secularization of consciousness, the desire for an earthly, worldly life;
2) the ignorance and illiteracy of the clergy, the contradictions between the sermons and the way of life of the clergy undermined the authority of the church;
3) the dissatisfaction of the German population with the growth of church extortions, the intervention of the church in everyday life and government;
4) bribery, sale of church posts and especially trade in indulgences (papal letter of absolution) caused protest and discontent among the population.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.