'Kick Against the Goads' in the Bible

Then said he, Who art thou, Lord? And the Lord said, I am Jesus whom thou art persecuting: It is difficult for thee to kick against the goads.

And as we were all fallen prostrate on the earth, I heard a voice speaking to me, and saving in the Hebrew tongue, Saul, Saul, why persecutest thou me? it is difficult for thee to kick against the goads.