This document discusses God's plan of fullness of life for humanity and how God chooses people throughout history to fulfill this plan, such as Jesus and John the Baptist. It examines their vocations according to passages from Isaiah, Paul's letter to the Corinthians, and the Gospel of John. The key points are that Jesus is the Lamb of God who takes away the sin of the world and the Son of God, and that all Christians are called to witness to Christ and prepare others for their encounter with God.