You ought to pray for those whom the Holy Spirit has made overseers over you.  This is what Saint Paul begs again and again of the churches to whom he writes…surely, if the great Saint Paul, that chosen vessel, that favorite of heaven, needed the most importunate prayers of his Christian converts, much more do the ordinary ministers of the gospel stand in need of the intercession of their respective flocks.

– George Whitefield
(Taken from George Whitefield Daily Readings edited by Randall J. Pederson)