Pascha (Easter) is the most important feast of the entire year, outranking by far all others. Each week of the Pentecostarion is named after the Gospel lesson which is read on the Sunday which begins it; for instance, the week that follows Thomas Sunday is referred to as Thomas Week. During the liturgical season of the Pentecostarion, the Gospel of John is read in full, as is the Acts of the Apostles. Both of these books were chosen because of their instructive content. Pascha (Easter) is the traditional time for baptizing new converts to the faith. So, just as Great Lent, with its liturgical book, the Triodion, was the final period of preparation for the catechumens before their baptism, so the time of the Pentecostarion is the time of initiation into the Sacred Mysteries of the Christian religion for the "Newly Illumined" (i.e., the newly baptized).