What did Jesus mean in Acts 9:5?

Act 9:5, And he said, Who art thou, Lord? And the Lord said, I am Jesus whom thou persecutest: it is hard for thee to kick against the pricks.

I used to wonder what the Lord meant when He said to Saul; "it is hard for thee to kick against the pricks."

This saying, “It is hard for you to kick against the pricks,” was a familiar saying to the Jews and anyone who made a living in agriculture.

An ox goad was a stick with a pointed piece of iron on its tip used to prod the oxen when plowing. The farmer would prod the animal to steer it in the right direction. Sometimes the animal would rebel by kicking out at the prick, and this would result in the sharp prod being driven even further into its flesh. In essence, the more an ox rebelled, the more it suffered. Thus, Jesus’ words to Saul on the road to Damascus: “It is hard for you to kick against the pricks.”