Acts 26:14 And when we were all fallen to the earth, I heard a voice speaking unto me, and saying in the Hebrew tongue, Saul, Saul, why persecutest thou me? it is hard for thee to kick against the pricks.
In the Bible lands oxen, which are used for plowing, are kept in the furrow by means of pricking with a goad, which is a nail fixed on the end of a stick. As long as the ox goes straight down the furrow, he is not pricked with the goad. But if he starts to stray out of line, he is pricked. An ox may kick back at the plowsman, but the plowsman holds the goad so that the ox kicks right into it. Saul thought that in persecuting the church he was doing the will of God. In reality he was out of line with God and was "kicking against the pricks" of God's Will.