The mysterious service begins in darkness on Holy Saturday and sunrise on Easter, and consists of four parts: The Service of Light (kindling of new fire, lighting the Paschal candle, the Exsultet); The Service of Lessons (readings from the Hebrew Scriptures interspersed with psalms, canticles, and prayers); Christian Initiation (Holy Baptism) or the Renewal of Baptismal Vows; and the Eucharist.