Edited From F. F. Bruce’s Commentary on the Book of Acts (ASV, 1901):
When Saul was on the road to Damascus a bright light from heaven flashed around him and his companions about noon of that day. Saul fell to the ground and heard a voice saying, “Saul, Saul, why do you persecute me?” Saul asked, “Who are you, Lord?” Jesus answered, “I am Jesus, whom you are persecuting. Now get up and go into the city, and you will be told what you must do.” The men traveling with Saul stood there speechless; they saw the light but did not hear the voice of Him that spoke to Saul.
These verses from Acts 9: 3-7 provide testimony to the internal communion Man can have in our time with the indwelling Holy Spirit by the grace of God through the sin sacrifice of His Son, Jesus Christ, who sent the Counselor and Comforter as promised upon HIs resurrection.