“In this connection I journeyed to Damascus with the authority and commission of the chief priests. 13 At midday, O king, I saw on the way a light from heaven, brighter than the sun, that shone around me and those who journeyed with me. 14 And when we had all fallen to the ground, I heard a voice saying to me in the Hebrew language, ‘Saul, Saul, why are you persecuting me? It is hard for you to kick against the goads’ (Acts 26:12-14 ESV).
Paul tells them of the Glory knocking him and his associates to the ground. And there was the Voice of the Messiah, Jesus of Nazareth, which only he heard, saying, “Saul, Saul, why are you persecuting me? It is hard for you to kick against the goads.” Those are exceptional words! The LORD used a common idiom of that day to convey to lost Paul that he was currently only succeeding in hurting himself.
Source: Paul’s Truth