"For he who is least among you all--he is the greatest." (Luke 9:48)
You all know the story. Saul was a devout and fervent Jew who persecuted Christians. He was there at the stoning of Stephen and gave approval. Thinking he was in God's will, "Saul began to destroy the church. Going from house to house, he dragged off men and women and put them in prison." (Acts 8:3) One day he decided to go to the town of Damascus and persecute the Christians there.
"As he neared Damascus on his journey, suddenly a light from heaven flashed around him. He fell to the ground and heard a voice say to him, 'Saul, Saul, why do you persecute me?'
'Who are you, Lord?' Saul asked.
'I am Jesus, whom you are persecuting,' he replied." (Acts 9:3-5)
Although Saul was now blind due to the light, Jesus still instructed Saul to go into Damascus and find a Christian man named Ananias. When Ananias and Paul met, Ananias explained to Paul what he had seen and heard. At that moment, something like scales fell from his eyes and he could see.
From that day forward Saul preached the gospel to all men with out fear.
Again I ask the question. Why did God intervene in Saul's life?
God knew Saul's heart. He knew that Saul wanted to serve God and love God. God, in his great mercy, showed Saul that he was persecuting the very God that he thought he was serving.