The purpose of life is to be converted to the Lord. For example, “in the year King Uzziah died,” Isaiah “saw the Lord” in the temple (Is 6:1). Isaiah was converted. He saw God’s glory, became painfully aware of his own sinfulness, was forgiven and purified, and accepted God’s call to be a prophet (Is 6:1ff).
Saul (Paul) was also converted. He did not see but heard the risen Lord (Acts 9:4). He was struck blind for three days, during which he prayed (Acts 9:8, 12). Then Ananias laid his hands on Saul and healed him of his blindness (Acts 9:17-18). Saul was baptized and filled with the Holy Spirit (Acts 9:17-18).
Simon Peter was converted when Jesus helped him have the best day at work that he had ever experienced (Lk 5:6). In his fishing business, he had never caught so many fish. Simon Peter knew it was a miracle. He became very aware of his sinfulness (Lk 5:8), “left everything,” and became a disciple of Jesus (Lk 5:11).