"Kicking Against the Pricks"
"It is hard for thee to kick against the pricks."
The plowman in the Bible Lands carries in his hand a long pole or goad, with a sharp metal point or prick on one end of the pole and at the other there is a flat piece of iron which is used to clean the plowshare. Quite often the young ox, probably not well broken in, will kick, because he does not like his work. The plowman then holds the pole or goad in such a position that when the ox kicks again, he will kick against that prick or sharp point, and thus the animal will learn it doesn't pay.
Paul, kicking against the plan of God, learned his mistake. "Saul, Saul, why persecutest thou me? It is hard for thee to kick against the pricks."
from page 66, Strange Scriptures that Perplex the Western Mind