The mistagogic experience present in the sources of ecclesiastic tradition, principally in the third and fourth centuries, is a strong and determining moment in the evangelization process, in the knowledge and adhesion to the Christian faith. Mistagogy is the pedagogy of the Mystery, an experience which respects and updates the relationship of dialogue and depth between the internal dynamics of the Revelation and the believer´s existential dynamics, suggesting a methodology which allows an effective process of evangelization. The early Church, inspired by and following the apostolic path, strongly characterized by the work of the Holy Ghost, who creates and gives life to the burgeoning community, acts in it and through it, takes mistagogy as the guiding principle for the mission and the process of evangelization, and lives its moment of theological and pastoral systematization with the Church Fathers in the third and fourth centuries, to which we will dedicate ourselves in this dissertation. In times of modern subjectivity crisis and paradigmatic changes in society, the evangelizing action goes through a process of revision and evaluation held by the institutions which commit themselves to evangelization, such as schools, parishes, pastoral actions or formation courses. This process has been through a number of questionings. One of the questionsis about the identity of the Christian evangelization, its social role in each age and the search for some planning and method which meet such demand. Therefore our objective is to rescue the mistagogic experience as source and reference for today´s evangelization, considering it as a charisma within the Church, light for today´s evangelization, and for the initiation catechesis itself.