As Jesus passed along the Sea of Galilee, he saw Simon and his brother Andrew casting a net into the lake—for they were fishermen. And Jesus said to them, ‘Follow me and I will make you fish for people.’ And immediately they left their nets and followed him. As he went a little farther, he saw James son of Zebedee and his brother John, who were in their boat mending the nets. Immediately he called them; and they left their father Zebedee in the boat with the hired men, and followed him. (Mark 1: 16-20)

Many sermons have been built around Simon and Andrew immediately (euthus) leaving their prior lives.

According to the gospel of John, Andrew had been with Jesus as a disciple of John the Baptist. In the fourth gospel John the Baptist tells Andrew that Jesus is the Messiah. Andrew immediately begins following Jesus and later tells his brother Simon. (John 1: 35-42)

According to the gospel of Luke upon his return to Galilee Jesus began preaching in synagogues, was rejected at Nazareth, performed his first miracles, moved to live with Andrew and Simon in Capernum and only then called his disciples. (Luke 4:16-41)

Luke also writes that Simon's first reaction was to say to Jesus, "Go away from me Lord, for I am a sinful man."

Whatever the time of preparation or immediate response, there came a day when a decision was presented: Do I follow Jesus or not? It is a decision that I will make today, tomorrow, and each day for the rest of my life.