kick against the pricks वाक्य

He saw theatre as a weapon with which ordinary people could break down the class barriers and that he had a'beholden duty to kick against the pricks '.
What would be the meaning of : " It is hard for you to kick against the pricks . " talk ) 12 : 39, 1 September 2009 ( UTC)
The phrase " It's hard for thee to kick against the pricks " is a quote from Acts 26 : 14, where Paul the Apostle describes his meeting Jesus while traveling to Damascus.
And the Lord said, I am Jesus whom thou persecutest : " [ it is ] " hard for thee to kick against the pricks . " According to the account in, he was blinded for three days and had to be led into Damascus by the hand.
But as it is, I don't know why http : / / en . wikipedia . org / ( for example ) shouldn't be called either a URL or a URI . Or to put it more bluntly : Why does W3C bother to kick against the pricks by calling such things URIs?